Fix mypy configuration

python/.pre-commit-config.yaml

python/__init__.py

python/pyproject.toml

python/tests/base_api/templates.py

...on/tests/base_api/test_operation_get_impacted_accounts.py

python/tests/base_api/test_recurrent_transfer_operation.py

.../test_serialize_and_deserialize_witness_set_properties.py

python/tests/base_api/test_update_proposal_operation.py

...fication_server_tests/test_appbase_notification_server.py

...ests/operation_visitor/test_abstract_operation_visitor.py

...s/operations/test_proto_account_create_with_delegation.py

python/tests/operations/test_proto_account_update.py

python/tests/operations/test_proto_account_update2.py

python/tests/operations/test_proto_account_witness_proxy.py

python/tests/operations/test_proto_account_witness_vote.py

...sts/operations/test_proto_cancel_transfer_from_savings.py

...on/tests/operations/test_proto_change_recovery_account.py

python/tests/operations/test_proto_claim_account.py

python/tests/operations/test_proto_claim_reward_balance.py

python/tests/operations/test_proto_collateralized_convert.py