add gapic_version.py

Author: parthea

release-please-config.json

@@ -4,8 +4,8 @@
  ".": {
  "release-type": "python",
  "extra-files": [
- "google/cloud/scheduler/gapic_version.py",
  "google/cloud/scheduler_v1beta1/gapic_version.py",
+ "google/cloud/scheduler/gapic_version.py",
  "google/cloud/scheduler_v1/gapic_version.py",
  {
  "type": "json",