Branch 1.12.x should merge into 2.1.x

Author: ondrejmirtes

.github/workflows/merge-maintained-branch.yml

@@ -20,5 +20,5 @@ jobs:
         with:
           github_token: "${{ secrets.PHPSTAN_BOT_TOKEN }}"
           source_ref: ${{ github.ref }}
-          target_branch: '2.0.x'
+          target_branch: '2.1.x'
           commit_message_template: 'Merge branch {source_ref} into {target_branch}'