ci: Update module checkout@v5 to v6

Follow-up to 'ci: Update modules to version compatible with Node.js 24' (f4b15bb).

Maintenance-Type: ci,unreviewed-change

Author: dpino

.github/workflows/build-and-test.yml

@@ -31,7 +31,7 @@ jobs:
   timestamp:
     runs-on: ubuntu-22.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/timestamp
 
   define-matrix:
@@ -71,7 +71,7 @@ jobs:
     runs-on: ubuntu-22.04
     needs: [define-matrix]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/kas-checkout
         with:
           machine: ${{ matrix.machine }}
@@ -89,7 +89,7 @@ jobs:
     runs-on: [self-hosted, builder]
     needs: [define-matrix, scarthgap-repo-init, timestamp]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/s3-configure
         env:
           S3_ACCESS_KEY: ${{ secrets.S3_ACCESS_KEY }}
@@ -119,7 +119,7 @@ jobs:
     runs-on: [self-hosted, builder]
     needs: [define-matrix, scarthgap-repo-init]
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/s3-configure
         env:
           S3_ACCESS_KEY: ${{ secrets.S3_ACCESS_KEY }}