MySQLCredentials block does not have a validator

[jmbhughes]

The CI has failed on a Prefect/pydantic error about the MySQLCredentials block not having a validator.

_______ ERROR collecting punchpipe/controlsegment/tests/test_launcher.py _______
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/_pytest/runner.py:341: in from_call
    result: Optional[TResult] = func()
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/_pytest/runner.py:372: in <lambda>
    call = CallInfo.from_call(lambda: list(collector.collect()), "collect")
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/_pytest/python.py:531: in collect
    self._inject_setup_module_fixture()
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/_pytest/python.py:545: in _inject_setup_module_fixture
    self.obj, ("setUpModule", "setup_module")
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/_pytest/python.py:310: in obj
    self._obj = obj = self._getobj()
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/_pytest/python.py:528: in _getobj
    return self._importtestmodule()
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/_pytest/python.py:617: in _importtestmodule
    mod = import_path(self.path, mode=importmode, root=self.config.rootpath)
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/_pytest/pathlib.py:567: in import_path
    importlib.import_module(module_name)
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/importlib/__init__.py:126: in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
<frozen importlib._bootstrap>:1050: in _gcd_import
    ???
<frozen importlib._bootstrap>:1027: in _find_and_load
    ???
<frozen importlib._bootstrap>:992: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:241: in _call_with_frames_removed
    ???
<frozen importlib._bootstrap>:1050: in _gcd_import
    ???
<frozen importlib._bootstrap>:1027: in _find_and_load
    ???
<frozen importlib._bootstrap>:992: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:241: in _call_with_frames_removed
    ???
<frozen importlib._bootstrap>:1050: in _gcd_import
    ???
<frozen importlib._bootstrap>:1027: in _find_and_load
    ???
<frozen importlib._bootstrap>:1006: in _find_and_load_unlocked
    ???
<frozen importlib._bootstrap>:688: in _load_unlocked
    ???
<frozen importlib._bootstrap_external>:883: in exec_module
    ???
<frozen importlib._bootstrap>:241: in _call_with_frames_removed
    ???
punchpipe/controlsegment/__init__.py:9: in <module>
    from punchpipe.controlsegment.db import Base, Flow, File
punchpipe/controlsegment/db.py:10: in <module>
    class MySQLCredentials(Block):
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/pydantic/v1/main.py:197: in __new__
    fields[ann_name] = ModelField.infer(
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/pydantic/v1/fields.py:506: in infer
    return cls(
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/pydantic/v1/fields.py:436: in __init__
    self.prepare()
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/pydantic/v1/fields.py:557: in prepare
    self.populate_validators()
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/pydantic/v1/fields.py:831: in populate_validators
    *(get_validators() if get_validators else list(find_validators(self.type_, self.model_config))),
/opt/hostedtoolcache/Python/3.10.13/x64/lib/python3.10/site-packages/pydantic/v1/validators.py:765: in find_validators
    raise RuntimeError(f'no validator found for {type_}, see `arbitrary_types_allowed` in Config')
E   RuntimeError: no validator found for <class 'pydantic.types.SecretStr'>, see `arbitrary_types_allowed` in Config

[jmbhughes]

I can recreate this error locally if I update pydantic in my dev environment.

[jmbhughes]

Will be resolved by #12