Update requirements.in (#985)
Update requirements.in (#985)

Co-authored-by: Nim Jayawardena <6bc27830e9ae130bde1a5c4ad1d20b3d77fe32b1@google.com>
GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo,GoogleCloudPlatform/microservices-demo