chore: switch version_bump workflow to deno bump-version

.github/workflows/version_bump.yml

@@ -1,6 +1,7 @@
 name: version_bump
 permissions:
   contents: write
+  pull-requests: write
 on: workflow_dispatch
 jobs:
   build:
@@ -11,17 +12,44 @@ jobs:
     steps:
       - name: Clone repository
         uses: actions/checkout@v6
+        with:
+          token: ${{ secrets.DENOBOT_PAT }}
 
       - name: Set up Deno
         uses: denoland/setup-deno@v2
         with:
+          # Pin to a Deno version that ships the workspace-aware
+          # `deno bump-version` (see denoland/deno#33689).
+          deno-version: canary
           cache: true
 
+      - name: Determine release branch
+        id: branch
+        run: echo "name=release-$(date -u +%Y-%m-%d-%H-%M-%S)" >> "$GITHUB_OUTPUT"
+
       - name: Run version bump
         run: |
           git fetch --unshallow origin
-          deno run -A jsr:@deno/bump-workspaces@^0.1/cli --import-map import_map.json
+          deno bump-version --import-map import_map.json
+
+      - name: Commit and push
         env:
-          GITHUB_TOKEN: ${{ secrets.DENOBOT_PAT }}
-          GIT_USER_NAME: ${{ github.actor }}
-          GIT_USER_EMAIL: ${{ github.actor}}@users.noreply.github.com
+          GH_TOKEN: ${{ secrets.DENOBOT_PAT }}
+          BRANCH: ${{ steps.branch.outputs.name }}
+        run: |
+          if git diff --quiet; then
+            echo "No version bumps detected; nothing to do."
+            exit 0
+          fi
+          git config user.name "${{ github.actor }}"
+          git config user.email "${{ github.actor }}@users.noreply.github.com"
+          git checkout -b "$BRANCH"
+          git add .
+          git commit -m "chore: update versions"
+          git push origin "$BRANCH"
+          gh pr create \
+            --base main \
+            --head "$BRANCH" \
+            --draft \
+            --title "chore: release $(date -u +%Y.%m.%d)" \
+            --body "Automated release PR generated by \`deno bump-version\`. Review the version bumps and \`Releases.md\` before merging."