Bump actions/github-script from v3 to v4.0.2 (#83)

Bumps [actions/github-script](https://github.com/actions/github-script) from v3 to v4.0.2.
- [Release notes](https://github.com/actions/github-script/releases)
- [Commits](actions/github-script@v3...a3e7071)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/binderbadge.yaml

@@ -11,7 +11,7 @@ jobs:
         uses: actions/checkout@v2
 
       - name: Comment on PR with Binder link
-        uses: actions/github-script@v3
+        uses: actions/github-script@v4.0.2
         env:
           BRANCH_NAME: ${{ github.event.pull_request.head.ref }}
         with: