Add missing import to test specification

Author: jyemin

driver-sync/src/test/unit/com/mongodb/client/internal/CryptConnectionSpecification.groovy

@@ -34,6 +34,7 @@ import org.bson.BsonBinaryWriter
 import org.bson.BsonDocument
 import org.bson.BsonDocumentWrapper
 import org.bson.BsonInt32
+import org.bson.BsonMaximumSizeExceededException
 import org.bson.BsonString
 import org.bson.Document
 import org.bson.RawBsonDocument