add fix for Lock not being a class until python 3.13

src/eduid/webapp/idp/sso_cache.py

@@ -109,7 +109,11 @@ class ExpiringCacheMem:
     :param lock: threading.Lock compatible locking instance
     """
 
-    def __init__(self, name: str, logger: logging.Logger | None, ttl: int, lock: Lock | None = None):
+    # TODO: fix when python 3.13 is our target environment
+    # use quote annotations on lock for now until python 3.13 is released
+    # threading.Lock is not a class but a factory function, see:
+    # https://github.com/python/cpython/pull/114479
+    def __init__(self, name: str, logger: logging.Logger | None, ttl: int, lock: "Lock | None" = None):
         self.logger = logger
         self.ttl = ttl
         self.name = name