build: update rules_browsers digest to 21c730b (main)

[angular-robot]

This PR contains the following updates:

Package	Type	Update	Change
rules_browsers	git_override	digest	6749ba4 -> 21c730b

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Configuration

📅 Schedule: Branch creation - "after 10:00pm every weekday,before 5:00am every weekday,every weekend" in timezone America/Tijuana, Automerge - At any time (no schedule defined).

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♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• If you want to rebase/retry this PR, check this box

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This PR has been generated by Renovate Bot.

[angular-robot]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: MODULE.bazel

Command failed: bazel mod deps --lockfile_mode=update
2025/10/06 12:46:22 Downloading https://releases.bazel.build/7.6.1/release/bazel-7.6.1-linux-x86_64...
Extracting Bazel installation...
Starting local Bazel server and connecting to it...
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ERROR: /home/runner/.cache/bazel/_bazel_runner/620418b06b457a3c635259edead3ff5c/external/rules_browsers~/browsers/extensions.bzl:24:23: name 'set' is not defined
ERROR: /home/runner/.cache/bazel/_bazel_runner/620418b06b457a3c635259edead3ff5c/external/rules_browsers~/browsers/extensions.bzl:25:29: name 'set' is not defined
ERROR: /home/runner/.cache/bazel/_bazel_runner/620418b06b457a3c635259edead3ff5c/external/rules_browsers~/browsers/extensions.bzl:26:24: name 'set' is not defined
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ERROR: Error loading '@@rules_browsers~//browsers:extensions.bzl' for module extensions, requested by @@rules_browsers~//:MODULE.bazel:9:25: compilation of module 'browsers/extensions.bzl' failed: compilation of module 'browsers/extensions.bzl' failed. Type 'bazel help mod' for syntax and help.