Fix ios cache (#7412)

* Fix Keychain cache

* Fix

* Fix import

app/utils/mattermost_managed.ts

@@ -64,3 +64,7 @@ export const deleteEntititesFile = (callback?: (success: boolean) => void) => {
         callback(true);
     }
 };
+
+export const invalidateKeychainCache = (serverUrl: string) => {
+    MattermostManaged.invalidateKeychainCache(serverUrl);
+};