chore: don't run commitlint on dependabot PRs

This fails the build when the commit is just a bit long, it's annoying.
There's no need - we merge these PRs anyway.

Author: rowanmanning

.github/workflows/commitlint.yml

@@ -1,5 +1,5 @@
 name: Enforce commit formatting
-on: [pull_request]
+on: [pull_request, push]
 jobs:
   run-commitlint-on-pr:
     runs-on: ubuntu-latest
@@ -18,4 +18,5 @@ jobs:
         run: npm install
 
       - name: Validate all commits from the PR
+        if: ${{ github.event.pull_request.user.login != 'dependabot' }}
         run: npx commitlint --from ${{ github.event.pull_request.base.sha }} --to ${{ github.event.pull_request.head.sha }} --verbose