chore: pin memtrack 1.6.0

[adriencaccia]

Points the runner at memtrack v1.6.0, which adds allocation stack capture for memory flamegraphs and faster event stream serialization for large memory benchmarks.

Hash verified against the published installer with GITHUB_ACTIONS=true cargo test all_pinned.

Refs COD-3675, which stays open for the runner v5.4.0 release this unblocks.

[greptile-apps]

Confidence Score: 5/5

[High risk] Updates a pinned binary dependency version and hash.

The pin update appears safe to merge.

Summary

The PR updates the Linux memtrack installer pin from 1.5.1 to 1.6.0 and replaces its expected SHA-256 digest.

_{Reviews (1) · Last reviewed commit: "chore: pin memtrack 1.6.0"}

[codspeed]

Merging this PR will not alter performance

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

✅ 31 untouched benchmarks
⏩ 6 skipped benchmarks¹

---

_{Comparing cod-3675-release-runner-and-memtrack (1393362) with main (0576920)}

Footnotes

1. 6 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩