chore(librarian): update gapic-generator to 1.30.5

[parthea]

This PR is needed to address the following failure in PR #15458 when attempting to enable the mypy presubmit.

.nox/mypy-3-14/lib/python3.14/site-packages/google/cloud/compute_v1beta/services/wire_groups/transports/base.py:88: error: Name "Any" is not defined  [name-defined]
.nox/mypy-3-14/lib/python3.14/site-packages/google/cloud/compute_v1beta/services/wire_groups/transports/base.py:88: note: Did you forget to import it from "typing"? (Suggestion: "from typing import Any")
.nox/mypy-3-14/lib/python3.14/site-packages/google/cloud/compute_v1beta/services/vpn_tunnels/transports/base.py:88: error: Name "Any" is not defined  [name-defined]

See googleapis/gapic-generator-python#2536 for more details

[gemini-code-assist]

Summary of Changes

Hello @parthea, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on resolving a critical mypy type-checking failure by upgrading the gapic-generator dependency. The update ensures that generated code correctly handles type hints, specifically the Any type, thereby preventing build failures and maintaining the integrity of static analysis checks.

Highlights

• Dependency Update: The gapic-generator dependency has been updated from version 1.30.4 to 1.30.5 in .generator/requirements.in.
• Mypy Fix: This update specifically addresses a mypy type-checking error where the Any type was reported as undefined in generated code, resolving a failure in a related pull request.

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[gemini-code-assist]

Code Review

This pull request updates the gapic-generator dependency to version 1.30.5. The purpose of this update is to resolve a mypy failure that occurs with Python 3.14, as detailed in the pull request description. The change is a simple version bump in the requirements file and is well-documented with a comment linking to the relevant fix. The update appears correct and necessary.