Bump actions/checkout from 3 to 4

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...v4)

---
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/ci.yml

@@ -34,7 +34,7 @@ jobs:
             development: true
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 50
       - uses: erlef/setup-beam@v1
@@ -83,7 +83,7 @@ jobs:
     steps:
       - name: Configure Git
         run: git config --global core.autocrlf input
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 50
       - uses: erlef/setup-beam@v1
@@ -108,7 +108,7 @@ jobs:
     name: Check POSIX-compliant
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 50
       - name: Install Shellcheck

.github/workflows/notify.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-20.04
     name: Notify
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 50
       - uses: erlef/setup-beam@v1

.github/workflows/release.yml

@@ -40,7 +40,7 @@ jobs:
             build_docs: build_docs
     runs-on: ubuntu-20.04
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 50
       - uses: ./.github/workflows/release_pre_built

.github/workflows/repo.hex.pm.yml

@@ -28,7 +28,7 @@ jobs:
     runs-on: ubuntu-20.04
     concurrency: builds_txt
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 50
       - uses: ./.github/workflows/release_pre_built