PYTHON-4112 Revert to testing with pymongocrypt@master

[ShaneHarvey]

Fixes these failures:

 [2024/01/30 13:28:18.641] test/unified_format.py:1722: in run_scenario
 [2024/01/30 13:28:18.641]     self._run_scenario(spec, uri)
 [2024/01/30 13:28:18.641] test/unified_format.py:1747: in _run_scenario
 [2024/01/30 13:28:18.641]     self.run_operations(spec["operations"])
 [2024/01/30 13:28:18.641] test/unified_format.py:1656: in run_operations
 [2024/01/30 13:28:18.641]     self.run_entity_operation(op)
 [2024/01/30 13:28:18.641] test/unified_format.py:1398: in run_entity_operation
 [2024/01/30 13:28:18.641]     result = cmd(**dict(arguments))
 [2024/01/30 13:28:18.641] /opt/python/pypy3.10/lib/pypy3.10/functools.py:303: in __call__
 [2024/01/30 13:28:18.641]     return self.func(*self.args, *args, **keywords)
 [2024/01/30 13:28:18.641] test/unified_format.py:1278: in _clientEncryptionOperation_createDataKey
 [2024/01/30 13:28:18.641]     return target.create_data_key(*args, **kwargs)
 [2024/01/30 13:28:18.641] pymongo/encryption.py:747: in create_data_key
 [2024/01/30 13:28:18.641]     with _wrap_encryption_errors():
 [2024/01/30 13:28:18.641] /opt/python/pypy3.10/lib/pypy3.10/contextlib.py:153: in __exit__
 [2024/01/30 13:28:18.641]     self.gen.throw(typ, value, traceback)
 [2024/01/30 13:28:18.641] _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
 [2024/01/30 13:28:18.641]     @contextlib.contextmanager
 [2024/01/30 13:28:18.641]     def _wrap_encryption_errors() -> Iterator[None]:
 [2024/01/30 13:28:18.641]         """Context manager to wrap encryption related errors."""
 [2024/01/30 13:28:18.641]         try:
 [2024/01/30 13:28:18.641]             yield
 [2024/01/30 13:28:18.641]         except BSONError:
 [2024/01/30 13:28:18.641]             # BSON encoding/decoding errors are unrelated to encryption so
 [2024/01/30 13:28:18.641]             # we should propagate them unchanged.
 [2024/01/30 13:28:18.641]             raise
 [2024/01/30 13:28:18.641]         except Exception as exc:
 [2024/01/30 13:28:18.641] >           raise EncryptionError(exc) from exc
 [2024/01/30 13:28:18.642] E           pymongo.errors.EncryptionError: unknown kms_provider: aws:name1
 [2024/01/30 13:28:18.642] pymongo/encryption.py:104: EncryptionError
 [2024/01/30 13:28:18.642] _ TestUnifiedNamedKMSCreateDataKey.test_create_datakey_with_named_Azure_KMS_provider _
 [2024/01/30 13:28:18.642]     @contextlib.contextmanager
 [2024/01/30 13:28:18.642]     def _wrap_encryption_errors() -> Iterator[None]:
 [2024/01/30 13:28:18.642]         """Context manager to wrap encryption related errors."""
 [2024/01/30 13:28:18.642]         try:
 [2024/01/30 13:28:18.642] >           yield
 [2024/01/30 13:28:18.642] pymongo/encryption.py:98:

https://spruce.mongodb.com/task/mongo_python_driver_tests_python_version_rhel8_test_encryption__platform~rhel8_auth_ssl~noauth_nossl_python_version~3.7_encryption~encryption_test_4.2_replica_set_0615df47b5251dc718ef91b24da3efb95d7b4f6f_24_01_30_20_00_24?execution=0&sortBy=STATUS&sortDir=ASC

[blink1073]

What I originally had in #1477 that we removed was:

if [ ! -d "libmongocrypt_git" ]; then
	git clone https://github.com/mongodb/libmongocrypt.git libmongocrypt_git
fi

[ShaneHarvey]

Do you want me to add that back?

[blink1073]

Yes please, it errors on subsequent runs otherwise.

[ShaneHarvey]

Done.

[blink1073]

LGTM!