fix(lock): set required_approving_review_count to 0 for solo maintainer

Agent-Logs-Url: https://github.com/petesramek/polyline-algorithm-csharp/sessions/6bd9c71f-abaa-4e8f-b469-435a52cfff0a

Co-authored-by: petesramek <2333452+petesramek@users.noreply.github.com>

Author: Copilot

.github/actions/github/branch-protection/lock/action.yml

@@ -1,6 +1,6 @@
 name: 'Lock branch'
 author: 'Pete Sramek'
-description: 'Apply branch protection to prevent direct pushes. Requires PRs with at least one approval.'
+description: 'Apply branch protection to prevent direct pushes. Requires PRs but no approvals (solo-maintainer friendly).'
 inputs:
   branch:
     description: 'Branch name to lock.'
@@ -29,7 +29,7 @@ runs:
           "required_pull_request_reviews": {
             "dismiss_stale_reviews": true,
             "require_code_owner_reviews": false,
-            "required_approving_review_count": 1
+            "required_approving_review_count": 0
           },
           "restrictions": null,
           "allow_force_pushes": false,