chore: switch bcr to 8.x instead of last_rc

[aignas]

It seems that we forgot to complete this TODO item.

Work towards #3392

[gemini-code-assist]

Summary of Changes

Hello @aignas, 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 finalizes the integration of Bazel 8.x into the project's continuous integration process. By replacing the last_rc (last release candidate) with the stable 8.x version in the presubmit test configurations, the project ensures that all new code changes are validated against the officially released version of Bazel 8, enhancing stability and adherence to the latest tooling standards.

Highlights

• Bazel Version Update: The Bazel version used in presubmit configurations has been updated from last_rc to 8.x in both .bcr/gazelle/presubmit.yml and .bcr/presubmit.yml.
• TODO Item Resolution: This pull request completes a previously identified TODO item to switch to the stable 8.x Bazel release once it became available, removing the placeholder last_rc.

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[gemini-code-assist]

Code Review

This pull request updates the Bazel presubmit configurations in .bcr/gazelle/presubmit.yml and .bcr/presubmit.yml. The change replaces the last_rc placeholder with 8.x for the Bazel version, which correctly addresses the TODO item to update the configuration once Bazel 8.x was available. The changes are straightforward and correct.