mark missed coverage spots

Author: miguelgrinberg

src/socketio/redis_manager.py

@@ -3,14 +3,14 @@
 import time
 from urllib.parse import urlparse
 
-try:
+try:  # pragma: no cover
     import redis
     from redis.exceptions import RedisError
 except ImportError:
     redis = None
     RedisError = None
 
-try:
+try:  # pragma: no cover
     import valkey
     from valkey.exceptions import ValkeyError
 except ImportError: