Merge branch '42509-fix-API-PUT-projects-fails-when-only-ci_config_path-is-specified' into 'master'

Resolve "API: PUT /projects/:id fails when only ci_config_path is specified"

Closes #42509

See merge request gitlab-org/gitlab-ce!17105

changelogs/unreleased/42509-fix-API-PUT-projects-fails-when-only-ci_config_path-is-specified.yml

+---
+title: Allow to call PUT /projects/:id API with only ci_config_path specified
+merge_request: 17105
+author: Laszlo Karpati
+type: fixed

lib/api/projects.rb

@@ -271,6 +271,7 @@ module API
           [
             :jobs_enabled,
             :resolve_outdated_diff_discussions,
+            :ci_config_path,
             :container_registry_enabled,
             :default_branch,
             :description,