chore: pin memtrack 1.5.1

[adriencaccia]

Points the runner at memtrack v1.5.1, which attaches the lifecycle and syscall hooks without perf_event_open and keeps mmap/munmap/brk as deprecated artifact variants instead of dropping them.

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

Refs COD-3543 — that issue also covers the runner patch release this unblocks.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge with no actionable issues identified.

Summary

Updates the Linux memtrack installer pin from version 1.5.0 to 1.5.1 and replaces its expected SHA-256 digest accordingly.

• Preserves the existing release URL and installation mechanism.
• Advances the exported memtrack version used by installation and compatibility checks.
• No actionable correctness, security, or repository-rule issues were identified.

_{Reviews (1) · Last reviewed commit: "chore: pin memtrack 1.5.1"}

[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.

✅ 17 untouched benchmarks

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_{Comparing chore/pin-memtrack-1.5.1 (0134b0c) with main (5b4a1a0)}