fix uri in username with test environment oidc test (#1597)

Author: durran

source/auth/tests/legacy/connection-string.json

@@ -375,7 +375,7 @@ tests:
   valid: false
   credential:
 - description: should throw an exception if username is specified for test (MONGODB-OIDC)
-  uri: mongodb://principalName@localhost/?authMechanism=MONGODB-OIDC&ENVIRONMENT:test
+  uri: mongodb://principalName@localhost/?authMechanism=MONGODB-OIDC&authMechanismProperties=ENVIRONMENT:test
   valid: false
   credential:
 - description: should throw an exception if specified environment is not supported (MONGODB-OIDC)