Bump actions/checkout from 5 to 6 in the ci group

Bumps the ci group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `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
  dependency-group: ci
...

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

Author: dependabot[bot]

.github/workflows/open-pr.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
@@ -29,7 +29,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: install score-compose
         uses: score-spec/setup-score@v3
         with:
@@ -46,7 +46,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: make kind-create-cluster
         run: |
           docker build -t ${{ env.WORKLOAD_NAME }}:test app/

.github/workflows/push-tag.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx