fix(ci): use github script v6 & `rest` namespace

.github/workflows/ui-tests.yaml

@@ -96,13 +96,13 @@ jobs:
       - name: Deploy to Vercel
         run: yarn vercel deploy --prebuilt --token ${{ secrets.vercel_token }} > _vercel-deployment-url
       - name: Comment on PR with deployment URL
-        uses: actions/github-script@v4
+        uses: actions/github-script@v6
         with:
           github-token: ${{ secrets.GITHUB_TOKEN }}
           script: |
             const fs = require('fs');
             const deploymentUrl = fs.readFileSync('_vercel-deployment-url', 'utf8');
-            github.issues.createComment({
+            await github.rest.issues.createComment({
               issue_number: context.issue.number,
               owner: context.repo.owner,
               repo: context.repo.repo,