Bump actions/checkout from 2 to 3

Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v2...v3)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/docker_builds.yml

@@ -15,7 +15,7 @@ jobs:
     name: "Arch Linux Base"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -37,7 +37,7 @@ jobs:
     name: "Ubuntu Bionic Base"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -59,7 +59,7 @@ jobs:
     name: "Debian armhf"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -81,7 +81,7 @@ jobs:
     name: "Debian aarch64"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -104,7 +104,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-base-bionic
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -127,7 +127,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-clang
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -150,7 +150,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-base-bionic
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -173,7 +173,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-base-bionic
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -196,7 +196,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-base-bionic
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -219,7 +219,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-simulation-bionic
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -242,7 +242,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-ros-melodic
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -265,7 +265,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-ros-melodic
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -287,7 +287,7 @@ jobs:
     name: "Ubuntu Focal Base"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -310,7 +310,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-base-focal
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -333,7 +333,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-base-focal
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -356,7 +356,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-simulation-focal
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -379,7 +379,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-ros-noetic
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -402,7 +402,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-base-focal
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -425,7 +425,7 @@ jobs:
     runs-on: ubuntu-latest
     needs: px4-dev-base-focal
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |
@@ -447,7 +447,7 @@ jobs:
     name: "Ubuntu Docs"
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Build container
       if: github.event_name == 'pull_request'
       run: |