Use uniform list annotation for alert codes

It's improved over the legacy List which should be dropped anyway.
In particular, it seems to be able to handle variance in the types of the
elements in ths list a bit better.

Signed-off-by: mulhern <amulhern@redhat.com>

Author: mulkieran

src/stratis_cli/_actions/_list_pool.py

@@ -23,7 +23,6 @@
     Any,
     Callable,
     Iterable,
-    List,
     Mapping,
 )
 from uuid import UUID
@@ -158,7 +157,7 @@ def __init__(
 
         (self.increased, self.decreased) = (increased, decreased)
 
-    def alert_codes(self, pool_object_path: str) -> List[PoolDeviceSizeChangeAlert]:
+    def alert_codes(self, pool_object_path: str) -> list[PoolDeviceSizeChangeAlert]:
         """
         Get the code from sets and one pool object path.
 
@@ -267,7 +266,7 @@ def _volume_key_loaded(mopool: Any) -> tuple[bool, bool] | tuple[bool, str]:
     @staticmethod
     def alert_codes(
         mopool: Any,
-    ) -> List[PoolEncryptionAlert | PoolAllocSpaceAlert | PoolMaintenanceAlert]:
+    ) -> list[PoolEncryptionAlert | PoolAllocSpaceAlert | PoolMaintenanceAlert]:
         """
         Return alert code objects for a pool.
 
@@ -286,7 +285,7 @@ def alert_codes(
 
         (vkl_is_bool, volume_key_loaded) = Default._volume_key_loaded(mopool)
 
-        pool_encryption_alerts = (
+        pool_encryption_alerts: list[PoolEncryptionAlert] = (
             [PoolEncryptionAlert.VOLUME_KEY_NOT_LOADED]
             if metadata_version is MetadataVersion.V2
             and mopool.Encrypted()