Redis: pick up fixes to GAPIC generator.

[yoshi-automation]

This PR was generated using Autosynth. 🌈

Here's the log from Synthtool:

synthtool > Cloning googleapis. synthtool > Running generator for google/cloud/redis/artman_redis_v1beta1.yaml. synthtool > Ensuring dependencies. synthtool > Pulling artman image. latest: Pulling from googleapis/artman Digest: sha256:90f9d15e9bad675aeecd586725bce48f5667ffe7d5fc4d1e96d51ff34304815b Status: Image is up to date for googleapis/artman:latest synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/redis-v1beta1. synthtool > Running generator for google/cloud/redis/artman_redis_v1.yaml. synthtool > Ensuring dependencies. synthtool > Pulling artman image. latest: Pulling from googleapis/artman Digest: sha256:90f9d15e9bad675aeecd586725bce48f5667ffe7d5fc4d1e96d51ff34304815b Status: Image is up to date for googleapis/artman:latest synthtool > Generated code into /home/kbuilder/.cache/synthtool/googleapis/artman-genfiles/python/redis-v1. synthtool > No replacements made in google/cloud/**/cloud_redis_client.py for pattern resources of the form:\n ``, maybe replacement is not longer needed? synthtool > No replacements made in google/cloud/**/cloud_redis_client.py for pattern parent \(str\): Required. The resource name of the instance location using the form: :: `projects/{project_id}/locations/{location_id}` where ``location_id`` refers to a GCP region, maybe replacement is not longer needed? synthtool > No replacements made in google/cloud/**/cloud_redis_client.py for pattern with the following restrictions: \* Must contain only lowercase letters, numbers, and hyphens\., maybe replacement is not longer needed? synthtool > No replacements made in google/cloud/**/cloud_redis_client.py for pattern name \(str\): Required. Redis instance resource name using the form: :: `projects/{project_id}/locations/{location_id}/instances/{instance_id}` where ``location_id`` refers to a GCP region, maybe replacement is not longer needed? synthtool > No replacements made in google/cloud/**/cloud_redis_client.py for pattern fields from ``Instance``: \* ``displayName`` \* ``labels`` \* ``memorySizeGb`` \* ``redisConfig``, maybe replacement is not longer needed? synthtool > Cleaned up 1 temporary directories. 

[tseaver]

Includes fixes from these PRs:

• googleapis/gapic-generator#2407
• googleapis/gapic-generator#2396