chore: update librarian image

[zhumin8]

update image to us-central1-docker.pkg.dev/cloud-sdk-librarian-prod/images-prod/librarian-go@sha256:d2dee66d7c8c1d673fac26280164ea24015b79491b7f9d6ba369e6a98ab3420c

created with go run github.com/googleapis/librarian/cmd/legacylibrarian@main update-image

[gemini-code-assist]

Summary of Changes

Hello @zhumin8, 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 routine maintenance by updating the librarian-go Docker image to its latest version and advancing the copyright year in a significant number of Go client library source files. These updates ensure the project's tooling is current and legal information is accurate.

Highlights

• Librarian Image Update: The librarian-go Docker image reference in .librarian/state.yaml has been updated to a new SHA256 hash: d2dee66d7c8c1d673fac26280164ea24015b79491b7f9d6ba369e6a98ab3420c.
• Copyright Year Roll-over: The copyright year in the headers of numerous Go client library files across various Google Cloud services has been incremented from 2025 to 2026.

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[gemini-code-assist]

Code Review

This pull request updates the librarian image hash and bumps the copyright year across numerous files. These changes appear to be automated as part of routine maintenance. The changes are consistent with the pull request's description, and I found no issues during the review.

[bhshkh]

LGTM