Bump actions/checkout from 5 to 6 (#50)

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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build-all-images.yaml

@@ -16,7 +16,7 @@ jobs:
       matrix: ${{ steps.matrix.outputs.matrix }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       name: pulling the branch
       with:
         fetch-depth: 1

.github/workflows/build-changed-images.yaml

@@ -16,7 +16,7 @@ jobs:
       matrix: ${{ steps.matrix.outputs.matrix }}
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       name: pulling the branch
       with:
         fetch-depth: 50

.github/workflows/build-image.yaml

@@ -37,7 +37,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Set Metadata
         id: set_meta