Bump actions/github-script from 6 to 8 (#773)

Bumps [actions/github-script](https://github.com/actions/github-script) from 6 to 8.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@v6...v8)

---
updated-dependencies:
- dependency-name: actions/github-script
  dependency-version: '8'
  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/release_canary.yml

@@ -47,7 +47,7 @@ jobs:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Output canary version number
-        uses: actions/github-script@v6
+        uses: actions/github-script@v8
         with:
           script: |
             const package = require(`${process.env.GITHUB_WORKSPACE}/theme/package.json`)