ci(update): new docs link in pull request description

.github/workflows/update.yml

@@ -22,7 +22,7 @@ jobs:
         with:
           title: "🤖📯 Octokit webhooks changed"
           body: |
-            I found new changes on [GitHub’s Webhooks Event Types & Payloads](https://developer.github.com/v3/activity/events/types/) and want to let you know about it 👋🤖
+            I found new changes on [GitHub’s Webhooks Event Types & Payloads](https://docs.github.com/en/free-pro-team@latest/developers/webhooks-and-events/webhook-events-and-payloads) and want to let you know about it 👋🤖
 
             I can't tell if the changes are fixes, features or breaking changes. 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/webhooks/blob/master/CONTRIBUTING.mdhttps://github.com/octokit/webhooks/blob/master/CONTRIBUTING.md#merging-the-pull-request--releasing-a-new-version).
           branch: "webhooks-update"