build(update.yml): set node-version to 16

Author: gr2m

.github/workflows/update.yml

@@ -1,9 +1,8 @@
 name: Update
-on:
+"on":
   repository_dispatch:
-    # https://github.com/apps/octokit-release-notifier
-    types: [octokit/webhooks release]
-
+    types:
+      - octokit/webhooks release
 jobs:
   update:
     runs-on: ubuntu-latest
@@ -12,6 +11,7 @@ jobs:
       - uses: actions/setup-node@v2
         with:
           cache: npm
+          node-version: 16
       - run: npm ci
       - uses: gr2m/await-npm-package-version-action@v1
         with:
@@ -27,11 +27,22 @@ jobs:
       - name: create pull request
         uses: gr2m/[email protected]
         env:
-          GITHUB_TOKEN: "${{ secrets.OCTOKITBOT_PAT }}"
+          GITHUB_TOKEN: ${{ secrets.OCTOKITBOT_PAT }}
         with:
-          title: "\U0001F6A7 \U0001F916\U0001F4EF Webhooks changed"
-          body: "A new release of [@octokit/webhooks-definitions](https://github.com/octokit/webhooks) was just released \U0001F44B\U0001F916\n\nThis pull request updates the TypeScript definitions derived from `@octokit/webhooks-definitions`. I can't tell if the changes are fixes, features or breaking, you'll have to figure that out on yourself and adapt the commit messages accordingly to trigger the right release, see [our commit message conventions](https://github.com/octokit/openapi/blob/main/CONTRIBUTING.md#merging-the-pull-request--releasing-a-new-version).\n"
-          branch: "update-octokit-webhooks"
+          title: 🚧 🤖📯 Webhooks changed
+          body: >
+            A new release of
+            [@octokit/webhooks-definitions](https://github.com/octokit/webhooks)
+            was just released 👋🤖
+
+
+            This pull request updates the TypeScript definitions derived from
+            `@octokit/webhooks-definitions`. I can't tell if the changes are
+            fixes, features or breaking, you'll have to figure that out on
+            yourself and adapt the commit messages accordingly to trigger the
+            right release, see [our commit message
+            conventions](https://github.com/octokit/openapi/blob/main/CONTRIBUTING.md#merging-the-pull-request--releasing-a-new-version).
+          branch: update-octokit-webhooks
           author: Octokit Bot <[email protected]>
           commit-message: "WIP: Webhooks changed - please review"
-          labels: "maintenance"
+          labels: maintenance