build: update PR title

Author: kgryte

.github/workflows/update_contributors.yml

@@ -96,7 +96,7 @@ jobs:
         uses: peter-evans/create-pull-request@b1ddad2c994a25fbc81a28b3ec0e368bb2021c50 # v6.0.0
         id: cpr
         with:
-          title: 'Update list of contributors'
+          title: 'docs: update list of contributors'
           body: |
             This PR