chore(deps): Bump actions/checkout from 4 to 6

.github/workflows/checks.yml

@@ -9,7 +9,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/setup-rust
       - run: echo "SQLX_OFFLINE=true" >> $GITHUB_ENV
       - uses: actions/cache@v4
@@ -27,7 +27,7 @@ jobs:
   clippy:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/setup-rust
       - uses: actions/cache@v4
         with:
@@ -45,7 +45,7 @@ jobs:
   fmt:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: ./.github/actions/setup-rust
       - uses: actions/cache@v4
         with:
@@ -63,7 +63,7 @@ jobs:
     name: Check compatibility of metadata API with AMB
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - run: docker compose up -d
       - uses: ./.github/actions/setup-rust
       - run: cargo build
@@ -73,7 +73,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: serlo/configure-repositories/actions/setup-mysql@main
       - uses: ./.github/actions/setup-rust
       - uses: actions-rs/cargo@v1

.github/workflows/deploy.yml

@@ -9,7 +9,7 @@ jobs:
     outputs:
       tag: ${{ steps.version.outputs.tag }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 2
       - id: version
@@ -22,7 +22,7 @@ jobs:
     needs: update-version
     if: ${{ needs.update-version.outputs.tag }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - uses: serlo/configure-repositories/actions/setup-node@main
       - uses: google-github-actions/auth@v2
         with:

.github/workflows/docker.yml

@@ -9,7 +9,7 @@ jobs:
     name: Build docker image
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Build the serlo-org-database-layer image