chore(librarian): update gapic-generator to 1.30.6

[parthea]

This PR is needed to address the issue in googleapis/gapic-generator-python#2548.

See googleapis/gapic-generator-python#2549 for more details. The release notes and changes for generated client libraries will be added in a separate PR.

[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 performs a routine dependency upgrade for the gapic-generator tool. The primary motivation for this update is to incorporate a fix for an issue concerning incorrect REST serialization, ensuring the generated client libraries function as expected with REST APIs. Further changes related to release notes and client library updates will be handled in a subsequent PR.

Highlights

• Dependency Update: The gapic-generator dependency has been updated from version 1.30.5 to 1.30.6.
• Bug Fix: This update addresses an issue related to incorrect REST serialization, as detailed in https://github.com/googleapis/gapic-generator-python/pull/2549.
• Related Issues: This PR is a prerequisite for resolving https://github.com/googleapis/gapic-generator-python/issues/2548.

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[gemini-code-assist]

Code Review

This pull request updates the gapic-generator dependency from version 1.30.5 to 1.30.6 to address a bug related to incorrect REST serialization. The change is straightforward, well-documented, and appears correct. No issues were found.