chore: update to gapic generator python 1.6.0 (#202)

* chore: Update to gapic-generator-python 1.6.0

feat(python): Add typing to proto.Message based class attributes

feat(python): Snippetgen handling of repeated enum field

PiperOrigin-RevId: 487326846

Source-Link: googleapis/googleapis@da380c7

Source-Link: googleapis/googleapis-gen@61ef576
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNjFlZjU3NjJlZTY3MzFhMGNiYmZlYTIyZmQwZWVjZWU1MWFiMWM4ZSJ9

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* feat: new APIs added to reflect updates to the filestore service

- Add ENTERPRISE Tier
- Add snapshot APIs: RevertInstance, ListSnapshots, CreateSnapshot, DeleteSnapshot, UpdateSnapshot
- Add multi-share APIs: ListShares, GetShare, CreateShare, DeleteShare, UpdateShare
- Add ConnectMode to NetworkConfig (for Private Service Access support)
- New status codes (SUSPENDED/SUSPENDING, REVERTING/RESUMING)
- Add SuspensionReason (for KMS related suspension)
- Add new fields to Instance information: max_capacity_gb, capacity_step_size_gb, max_share_count, capacity_gb, multi_share_enabled

PiperOrigin-RevId: 487492758

Source-Link: googleapis/googleapis@5be5981

Source-Link: googleapis/googleapis-gen@ab0e217
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiYWIwZTIxN2Y1NjBjYzJjMWFmYzExNDQxYzJlYWI2YjY5NTBlZmQyYiJ9

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* update path to snippet metadata json

* fix docs build

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>
Co-authored-by: Anthonios Partheniou <partheniou@google.com>

packages/google-cloud-artifact-registry/docs/artifactregistry_v1/types.rst

@@ -3,5 +3,4 @@ Types for Google Cloud Artifactregistry v1 API
 
 .. automodule:: google.cloud.artifactregistry_v1.types
     :members:
-    :undoc-members:
     :show-inheritance:

packages/google-cloud-artifact-registry/docs/artifactregistry_v1beta2/types.rst

@@ -3,5 +3,4 @@ Types for Google Cloud Artifactregistry v1beta2 API
 
 .. automodule:: google.cloud.artifactregistry_v1beta2.types
     :members:
-    :undoc-members:
     :show-inheritance: