Fix mypy linter errors

Author: inlined

samples/https_flask/functions/main.py

@@ -25,11 +25,11 @@ def httpsflaskexample(request):
     return entrypoint(app, request)
 
 @https_fn.on_call()
-def callableexample(request: https_fn.Request):
+def callableexample(request: https_fn.CallableRequest):
     return request.data
 
 @https_fn.on_call()
-def streamingcallable(request: https_fn.Request):
+def streamingcallable(request: https_fn.CallableRequest):
     yield "Hello,"
     yield "world!"
     return request.data

src/firebase_functions/firestore_fn.py

@@ -219,7 +219,7 @@ def _firestore_endpoint_handler(
         func(database_event_with_auth_context)
     else:
         # mypy cannot infer that the event type is correct, hence the cast
-        _typing.cast(_C1 | _C2, func)(database_event)
+        _typing.cast(_C1 | _C2, func)(database_event) # type: ignore
 
 
 @_util.copy_func_kwargs(FirestoreOptions)