PYTHON-4738 Skip encryption test_fork on PyPy

[blink1073]

No description provided.

[ShaneHarvey]

These failures are not new, they seem to have started a long time ago:

 [2024/09/17 17:08:34.322] self = <test.asynchronous.test_encryption.TestKmsTLSOptions testMethod=test_01_aws>
 [2024/09/17 17:08:34.322]     async def test_01_aws(self):
 [2024/09/17 17:08:34.322]         key = {
 [2024/09/17 17:08:34.322]             "region": "us-east-1",
 [2024/09/17 17:08:34.322]             "key": "arn:aws:kms:us-east-1:579766882180:key/89fcc2c4-08b0-4bd9-9f25-e30687b580d0",
 [2024/09/17 17:08:34.322]             "endpoint": "127.0.0.1:9002",
 [2024/09/17 17:08:34.322]         }
 [2024/09/17 17:08:34.322]         with self.assertRaisesRegex(EncryptionError, self.cert_error):
 [2024/09/17 17:08:34.322]             await self.client_encryption_no_client_cert.create_data_key("aws", key)
 [2024/09/17 17:08:34.322]         # "parse error" here means that the TLS handshake succeeded.
 [2024/09/17 17:08:34.322]         with self.assertRaisesRegex(EncryptionError, "parse error"):
 [2024/09/17 17:08:34.322]             await self.client_encryption_with_tls.create_data_key("aws", key)
 [2024/09/17 17:08:34.322]         # Some examples:
 [2024/09/17 17:08:34.322]         # certificate verify failed: certificate has expired (_ssl.c:1129)
 [2024/09/17 17:08:34.322]         # amazon1-2018 Python 3.6: certificate verify failed (_ssl.c:852)
 [2024/09/17 17:08:34.322]         key["endpoint"] = "127.0.0.1:9000"
 [2024/09/17 17:08:34.322]         with self.assertRaisesRegex(EncryptionError, "expired|certificate verify failed"):
 [2024/09/17 17:08:34.322]             await self.client_encryption_expired.create_data_key("aws", key)
 [2024/09/17 17:08:34.322]         # Some examples:
 [2024/09/17 17:08:34.322]         # certificate verify failed: IP address mismatch, certificate is not valid for '127.0.0.1'. (_ssl.c:1129)"
 [2024/09/17 17:08:34.322]         # hostname '127.0.0.1' doesn't match 'wronghost.com'
 [2024/09/17 17:08:34.322]         # 127.0.0.1:9001: ('Certificate does not contain any `subjectAltName`s.',)
 [2024/09/17 17:08:34.322]         key["endpoint"] = "127.0.0.1:9001"
 [2024/09/17 17:08:34.322] >       with self.assertRaisesRegex(
 [2024/09/17 17:08:34.322]             EncryptionError, "IP address mismatch|wronghost|IPAddressMismatch|Certificate"
 [2024/09/17 17:08:34.322]         ):
 [2024/09/17 17:08:34.322] E       AssertionError: "IP address mismatch|wronghost|IPAddressMismatch|Certificate" does not match "SSL handshake failed: 127.0.0.1:9001: timed out (configured timeouts: socketTimeoutMS: 20000.0ms, connectTimeoutMS: 20000.0ms)"