Bump actions/github-script from 5 to 6

Bumps [actions/github-script](https://github.com/actions/github-script) from 5 to 6.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](https://github.com/actions/github-script/compare/v5...v6)

---
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/deploy-preview.yml

@@ -18,7 +18,7 @@ jobs:
       - run: npm install unzipper@0.10
 
       - name: Get pull request number
-        uses: actions/github-script@v5
+        uses: actions/github-script@v6
         id: pull-request-number
         with:
           result-encoding: string
@@ -66,7 +66,7 @@ jobs:
         run: netlify deploy --dir=build/site --alias=deploy-preview-${{steps.pull-request-number.outputs.result}}
 
       - name: Add comment to pull request
-        uses: actions/github-script@v5
+        uses: actions/github-script@v6
         with:
           script: |
             const pullRequestNumber = parseInt(${{steps.pull-request-number.outputs.result}}, 10);