fix: nightly security dependency updates

[github-actions]

Security Update

This is an automated PR triggered by the nightly OSV-Scanner security scan.

The following dependencies were updated to resolve known vulnerabilities:

Package & Version	Advisory Link
golang.org/x/net@v0.55.0	GO-2026-5025
golang.org/x/net@v0.55.0	GO-2026-5026
golang.org/x/net@v0.55.0	GO-2026-5027
golang.org/x/net@v0.55.0	GO-2026-5028
golang.org/x/net@v0.55.0	GO-2026-5029
golang.org/x/net@v0.55.0	GO-2026-5030

Verification: Updated via go get <pkg>@v<version> and go mod tidy.

Note: This PR was created with GITHUB_TOKEN, which does not trigger pull_request workflows.
CI checks will not run automatically. Push an empty commit (git commit --allow-empty -m "trigger CI")
to kick off CI before merging.

TODO: Migrate to a GitHub App token via actions/create-github-app-token to trigger CI automatically.

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[google-oss-prow]

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