ci: refresh .bench_durations

[github-actions]

Description

Automated refresh of .github/.bench_durations (duration-balanced shard assignment for test-benchmark).

Triggered because the benchmark set changed in the nightly run:
+1 benchmark(s) added, -0 removed.
Pure timing drift does not trigger this PR. Review and merge to keep the shards balanced.

CI Configuration

config:
  build: true
  # valid options are "ops", "benchmark", and "sanity"
  test: [benchmark]

Checklist

• Code formatted and imports sorted via repo specifications (./format.sh) — N/A, data-only change
• Documentation updated (if needed) — N/A
• CI configuration reviewed

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