chore: bump instrument-hooks

[not-matthias]

Works as expected now:

$ cargo bench
   Compiling codspeed v4.2.1 (/home/not-matthias/Documents/work/wgit/codspeed-rust/crates/codspeed)
   Compiling codspeed-divan-compat-walltime v4.2.1 (/home/not-matthias/Documents/work/wgit/codspeed-rust/crates/divan_compat/divan_fork)
   Compiling codspeed-divan-compat v4.2.1 (/home/not-matthias/Documents/work/wgit/codspeed-rust/crates/divan_compat)
    Finished `bench` profile [optimized] target(s) in 3.69s
     Running unittests src/lib.rs (/home/not-matthias/Documents/work/wgit/codspeed-rust/target/release/deps/codspeed_divan_compat-80cd5bd1ab1d286e)

running 0 tests

test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out; finished in 0.00s

     Running benches/basic_example.rs (/home/not-matthias/Documents/work/wgit/codspeed-rust/target/release/deps/basic_example-a9e1bda108a3123a)
Timer precision: 20 ns
basic_example       fastest       │ slowest       │ median        │ mean          │ samples │ iters
├─ fibo_10          1.223 ns      │ 8.845 ns      │ 1.229 ns      │ 1.321 ns      │ 100     │ 204800
├─ fibo_50          1.526 ns      │ 3.582 ns      │ 1.532 ns      │ 1.557 ns      │ 100     │ 204800
├─ mut_borrow       1.116 ns      │ 23.41 ns      │ 1.794 ns      │ 2.324 ns      │ 100     │ 204800
╰─ const_bench                    │               │               │               │         │
   ├─ bench_array1                │               │               │               │         │
   │  ├─ 1          1.223 ns      │ 1.234 ns      │ 1.229 ns      │ 1.227 ns      │ 100     │ 204800
   │  ├─ 4          7.421 ns      │ 31.86 ns      │ 7.46 ns       │ 7.722 ns      │ 100     │ 51200
   │  ├─ 10         9.552 ns      │ 11.66 ns      │ 9.595 ns      │ 9.68 ns       │ 100     │ 25600

Depends on CodSpeedHQ/instrument-hooks#18

[Copilot]

Pull request overview

This PR updates the instrument-hooks submodule dependency to incorporate fixes that enable proper benchmark execution with the codspeed-divan-compat crate.

Changes:

• Updated instrument-hooks submodule commit reference to version 8e6c3d2

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[codspeed-hq]

CodSpeed Performance Report

Merging this PR will degrade performance by 3.49%

_{Comparing cod-2025-bump-instrument-hooks-in-rust-to-allow-running-benchmarks (d6cfa72) with main (693edb3)}

Summary

❌ 1 regressed benchmark
✅ 390 untouched benchmarks
⏩ 189 skipped benchmarks¹

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Simulation	process_items_with_counter	806.7 ns	835.8 ns	-3.49%

Footnotes

1. 189 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. ↩