[AI] Skip release notes check for Dependabot PRs (#8185)

Dependabot never adds a file under upcoming-release-notes/, so the
check-release-notes job always failed on its PRs. Skip the check when
the PR author is dependabot[bot].

https://claude.ai/code/session_014oT7jczAkGT8RSwJYpPBur

Co-authored-by: Claude <[email protected]>

.github/workflows/release-notes.yml

@@ -23,6 +23,7 @@ jobs:
       github.event_name == 'pull_request'
       && github.head_ref != 'release'
       && startsWith(github.head_ref, 'release-notes/') == false
+      && github.event.pull_request.user.login != 'dependabot[bot]'
     runs-on: ubuntu-latest
     permissions:
       contents: read

upcoming-release-notes/dependabot-release-notes.md

@@ -0,0 +1,6 @@
+---
+category: Maintenance
+authors: [MatissJanis]
+---
+
+Skip the release notes check for Dependabot pull requests