ci: concurrency protect tag flow

We just need to run it once properly and dont need to keep running it
for every push until the last.

Signed-off-by: Austin Horstman <khaneliman12@gmail.com>

.github/workflows/tag-maintainers.yml

@@ -2,6 +2,9 @@ name: Tag Module Maintainers
 on:
   pull_request_target:
     types: [opened, ready_for_review, reopened, synchronize]
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event_name == 'pull_request' && github.head_ref || github.run_id }}
+  cancel-in-progress: true
 permissions:
   contents: read
   pull-requests: write