chore: update librarian version to v0.42.0

[suztomo]

Update librarian version to v0.42.0.

Included Librarian Updates

• chore(main): release 0.42.0 librarian#7524: chore(main): release 0.42.0
• chore(main): release 0.41.0 librarian#7473: chore(main): release 0.41.0
• fix(internal/librarian): update bulk release-please config for existing python libraries librarian#7508: fix(internal/librarian): update bulk release-please config for existing python libraries
• build(.github/workflows): separate java integration test into standalone job librarian#7489: build(.github/workflows): separate java integration test into standalone job
• ci(.github): increase timeout of php integration test librarian#7491: ci(.github): increase timeout of php integration test
• refactor(internal/config): remove nodejs_apis from NodejsPackage librarian#7487: refactor(internal/config): remove nodejs_apis from NodejsPackage
• build(.github): add test matrix for PHP librarian#7469: build(.github): add test matrix for PHP
• build(deps): bump google.golang.org/grpc from 1.82.1 to 1.83.1 librarian#7482: build(deps): bump google.golang.org/grpc from 1.82.1 to 1.83.1

[gemini-code-assist]

Code Review

This pull request updates various protocol buffer definitions and generated TypeScript files across multiple packages. The changes primarily involve removing deprecated fields (such as libraryPackage, batching, and unreachable), updating edition constants, and enabling cc_enable_arenas for specific RPC and type definitions. There are no review comments to address.

[suztomo]

I don't see any code changes.