build(deps): bump actions/checkout from 5 to 6 (#3917)

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

Author: dependabot[bot]

.github/workflows/acceptance-tests.yml

@@ -54,7 +54,7 @@ jobs:
     #   url: https://renku-ci-ui-${{ github.event.number }}.dev.renku.ch
     steps:
       - name: Checkout renku repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           repository: SwissDataScienceCenter/renku
           sparse-checkout: |

.github/workflows/api-specs-up-to-date.yml

@@ -29,7 +29,7 @@ jobs:
         working-directory: ./client
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up node 22
         uses: actions/setup-node@v6
         with:

.github/workflows/cleanup-old-deployments.yml

@@ -7,7 +7,7 @@ jobs:
   cleanup-old-deployments-from-github:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - uses: actions/github-script@v8

.github/workflows/prepare-release.yml

@@ -20,7 +20,7 @@ jobs:
   create-release-pr:
     runs-on: ubuntu-24.04
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           token: "${{ secrets.RENKUBOT_GITHUB_TOKEN }}"
       - name: Setup Git

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

@@ -17,7 +17,7 @@ jobs:
       run:
         working-directory: ./client
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up node ${{ matrix.node-version }}
         uses: actions/setup-node@v6
         with:
@@ -46,7 +46,7 @@ jobs:
       run:
         working-directory: ./server
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up node ${{ matrix.node-version }}
         uses: actions/setup-node@v6
         with:
@@ -74,7 +74,7 @@ jobs:
       run:
         working-directory: ./client
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: actions/setup-node@v6
         with:
           node-version: "22"
@@ -91,7 +91,7 @@ jobs:
       run:
         working-directory: ./tests
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up node ${{ matrix.node-version }}
         uses: actions/setup-node@v6
         with:
@@ -108,7 +108,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Install client
         uses: cypress-io/github-action@v6
         with:
@@ -147,7 +147,7 @@ jobs:
     runs-on: ubuntu-24.04
     if: "startsWith(github.ref, 'refs/tags/')"
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up QEMU