chore(main): release google-cloud-bigtable 2.42.0

[quirogas]

🤖 I have created a release beep boop

2.42.0 (2026-08-19)

Features

• bigtable: client side metrics handlers (#16760) (43b786c)
• bigtable: initialize internal data client in classic client (#18080) (92008e2)

Bug Fixes

• bigtable: data client should acknowledge all mutations in batch (#18124) (e7f6a34)
• bigtable: report swallowed batch flush errors and unacknowledged entries (#18122) (2fe5bdc)
• bigtable: standardize client side metrics (#17899) (a69e2cb)
• bigtable: surface batcher flush errors and disable timer (#18145) (fac536e)
• bump grpcio to 1.59.0; require Python 3.10+ (#17351) (a53487a)

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This PR was generated with Release Please. See documentation.

[gemini-code-assist]

Code Review

This pull request bumps the version of the google-cloud-bigtable package from 2.41.0 to 2.42.0 across various configuration, metadata, and version files, and updates the package's changelog to document the new features and bug fixes in this release. There are no review comments, and I have no feedback to provide.

[quirogas]

Once #18145 is included in the release, we can merge this PR.

[parthea]

Following up on #18144 (comment) now that #18145 was merged:

Since this PR was created manually, we need to either merge main into this branch and update the release notes, or close this PR and create a new one.

[parthea]

Switching to draft since additional work is needed as per #18144 (comment)

[quirogas]

Switching to draft since additional work is needed as per #18144 (comment)

Removed "do not merge" label and marked the PR as ready for review as (#18145) (fac536e) is now bundled in this release.

[release-please]

🤖 Created releases:

• google-cloud-bigtable-v2.42.0

🌻