ci(test): fix test-suite timeout cancellations

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Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
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Fixes #???

Port of #554 onto post-release.

The Run Test Suite job is cancelled with "The job has exceeded the maximum execution time of 15m0s" → "The operation was canceled." This reads like a failure but is a timeout. The turbo compact step now consumes ~14 of the 15-minute budget compiling ZK circuits (the multisig/ group alone is ~8 minutes), so the test step never meaningfully runs before the limit hits.

This PR, against post-release:

• Raises timeout-minutes from 15 to 30 in test.yml.
• Pins actions/cache from v4.3.0 (Node 20, deprecated on runners from 2026-06-16) to v5.0.5 (Node 24).

PR Checklist

• I have read the Contributing Guide
• I have added tests that prove my fix is effective or that my feature works. See GUIDELINES.md#testing for more information.
• I have added documentation for new methods or changes to existing method behavior. See GUIDELINES.md#documentation for more information.
• CI Workflows Are Passing

Further comments

CI-only change targeting post-release. Same two commits as #554 (already merged to main).

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