chore: Update gapic-generator-python to v1.6.1

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PiperOrigin-RevId: 488036204

Source-Link: googleapis/googleapis@08f275f

Source-Link: https://github.com/googleapis/googleapis-gen/commit/555c0945e60649e38739ae64bc45719cdf72178f
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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: https://github.com/googleapis/googleapis-gen/commit/ab0e217f560cc2c1afc11441c2eab6b6950efd2b
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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: https://github.com/googleapis/googleapis-gen/commit/61ef5762ee6731a0cbbfea22fd0eecee51ab1c8e
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chore: update to gapic-generator-python 1.5.0

feat: add support for google.cloud.<api>.__version__
PiperOrigin-RevId: 484665853

Source-Link: googleapis/googleapis@8eb249a

Source-Link: https://github.com/googleapis/googleapis-gen/commit/c8aa327b5f478865fc3fd91e3c2768e54e26ad44
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