[github] bump actions/github-script from 6 to 7 (#22)

Bumps [actions/github-script](https://github.com/actions/github-script) from 6 to 7.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@v6...v7)

---
updated-dependencies:
- dependency-name: actions/github-script
  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>

.github/workflows/buildx.yaml

@@ -28,7 +28,7 @@ jobs:
       uses: actions/checkout@v4  # See https://github.com/actions/checkout
 
     - name: Validate event inputs
-      uses: actions/github-script@v6  # See https://github.com/actions/github-script
+      uses: actions/github-script@v7  # See https://github.com/actions/github-script
       with:
         script: |
           for (const [key, value] of Object.entries(context.payload.inputs)) {
@@ -76,7 +76,7 @@ jobs:
     # See also https://github.com/docker/metadata-action
     - name: Generate labels
       id: generate_labels
-      uses: actions/github-script@v6  # See https://github.com/actions/github-script
+      uses: actions/github-script@v7  # See https://github.com/actions/github-script
       with:
         script: |
           const labels = []