chore(deps): bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/docs.yaml

@@ -9,7 +9,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
     - name: "Checkout"
-      uses: "actions/checkout@v5"
+      uses: "actions/checkout@v6"
       with:
         fetch-depth: 0
     - name: "Install Nix"

.github/workflows/new_version.yaml

@@ -5,7 +5,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
     - name: "Checkout"
-      uses: "actions/checkout@v5"
+      uses: "actions/checkout@v6"
       with:
         fetch-depth: 0
         submodules: "recursive"

.github/workflows/release.yaml

@@ -5,7 +5,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
     - name: "Checkout"
-      uses: "actions/checkout@v5"
+      uses: "actions/checkout@v6"
       with:
         fetch-depth: 0
         fetch-tags: true
@@ -71,7 +71,7 @@ jobs:
     runs-on: "ubuntu-latest"
     steps:
     - name: "Checkout"
-      uses: "actions/checkout@v5"
+      uses: "actions/checkout@v6"
     - name: "Download generated debs"
       uses: "actions/download-artifact@v6"
       with:

.github/workflows/test.yaml

@@ -15,7 +15,7 @@ jobs:
         version: [linux-rockchip, linux-rk356x, linux-stable, linux-rk2312, linux-rk2410, linux-rk2410-nocsf, linux-aw2501, linux-a733, linux-qcom]
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Check if there is missing files
         shell: bash
         run: |