Bump actions/github-script from 6 to 7

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>

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

@@ -596,7 +596,7 @@ jobs:
     needs: [publish-stable]
     if: startsWith(github.ref, 'refs/tags/v') && github.repository == 'open-telemetry/opentelemetry-collector-contrib'
     steps:
-      - uses: actions/github-script@v6
+      - uses: actions/github-script@v7
         with:
           script: |
             const milestones = await github.rest.issues.listMilestones({

.github/workflows/milestone-add-to-pr.yml

@@ -13,7 +13,7 @@ jobs:
     if: github.event.pull_request.merged
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/github-script@v6
+      - uses: actions/github-script@v7
         with:
           script: |
             const milestones = await github.rest.issues.listMilestones({