Add PR auto-labeler workflow configuration and fix CI failure

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
             test-script: test:with-coverage
             upload-coverage: true
           - os: ubuntu-latest
-            python-version: pypy-3.9-v7.x
+            python-version: pypy-3.11
             py: pypy3
             test-script: test:test
           - os: macos-latest
@@ -71,7 +71,7 @@ jobs:
           - python-version: '3.12'
           - python-version: '3.13'
           - python-version: '3.14'
-          - python-version: pypy-3.9-v7.x
+          - python-version: pypy-3.11
             py: pypy3
     runs-on: ubuntu-latest
     steps:

.github/workflows/labeler.yml

@@ -0,0 +1,15 @@
+name: PR Auto-labeler
+
+on:
+  # pull_request event is required for auto-labeler
+  pull_request:
+    types: [opened, reopened, synchronize]
+
+permissions: {}
+
+jobs:
+  draft-release:
+    permissions:
+      pull-requests: write
+      contents: read
+    uses: mkdocs-ng/.github/.github/workflows/pr-labeler.yml@main

docs/about/release-notes.md

@@ -34,6 +34,7 @@ The current members of the MkDocs-NG team.
 
 * Remove the unmaintained `mergedeep` dependency by replacing it with an internal deep-merge helper for inherited YAML configuration. #29
 * Add a release-note generation skill and repository agent instructions to make maintainer workflows more consistent. #35
+* Upgrade `PyPy` from 3.9 to 3.11 to fix CI failure and add a PR auto-labeler workflow to automatically tag incoming pull requests. #37
 
 ## Version 1.7.0 (2026-04-24)