docs(allocator): update comments about bumpalo version

[overlookmotel]

We've bumped bumpalo to v3.19.0. Update comments to reflect this.

[overlookmotel]

• docs(allocator): update comments about bumpalo version #12033 👈 (View in Graphite)
• main

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[overlookmotel]

Merge activity

• Jul 2, 12:12 PM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Jul 2, 12:20 PM UTC: overlookmotel added this pull request to the Graphite merge queue.

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #12033 will not alter performance

_{Comparing 07-02-docs_allocator_update_comments_about_bumpalo_version (f0eaf9a) with main (0c7f9e8)}

Summary

✅ 38 untouched benchmarks