Add checks to release branches

Author: dsp-ant

.github/workflows/main-checks.yml

@@ -2,7 +2,9 @@ name: Main branch checks
 
 on:
   push:
-    branches: [main]
+    branches:
+      - main
+      - 'v*.*.*'
 
 jobs:
   checks:

src/mcp/client/__main__.py

@@ -1,8 +1,8 @@
+import argparse
 import logging
 import sys
 from functools import partial
 from urllib.parse import urlparse
-import argparse
 
 import anyio