chore: use mimalloc for codspeed benchmark allocator

[stormslowly]

Summary

Port of web-infra-dev/rspack#13966 to this repo's benchmark harness.

• Route NeverGrowInPlaceAllocator alloc/dealloc through mimalloc::MiMalloc on non-wasm targets so CodSpeed can white-box allocator activity.
• Keep the wrapper without a realloc override to preserve never-grow-in-place benchmark behavior — realloc falls through to the default GlobalAlloc::realloc (alloc-new + copy + dealloc-old), which is what stabilizes results.
• Keep wasm on System and align mimalloc feature flags (local_dynamic_tls on Linux, v3 everywhere) with rspack_allocator.

Verification

• `cargo check --benches --all-features`
• `cargo clippy --bench resolver --all-features` — no new warnings in the modified region
• `cargo fmt --check`
• pre-commit hooks (fmt + taplo + clippy with `-D warnings`) green

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This PR ports rspack’s CodSpeed benchmark allocator setup into rspack-resolver by routing benchmark allocations through mimalloc (on non-wasm targets) while preserving the “never grow in place” realloc behavior to stabilize benchmark results.

Changes:

• Add target-specific mimalloc dev-dependencies (with feature flags aligned to rspack’s benchmark harness).
• Update the benchmark global allocator to wrap mimalloc::MiMalloc on non-wasm and System on wasm, while intentionally not overriding realloc.
• Regenerate Cargo.lock to include mimalloc and related transitive updates.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
Cargo.toml	Adds target-specific mimalloc dev-dependencies for benchmarks.
Cargo.lock	Locks mimalloc + transitive dependencies and updates windows-sys entries accordingly.
benches/resolver.rs	Switches benchmark global allocator to a wrapper around mimalloc (non-wasm) / System (wasm) without realloc override.

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[codspeed-hq]

Merging this PR will degrade performance by 94.31%

⚡ 2 improved benchmarks
❌ 1 regressed benchmark
✅ 9 untouched benchmarks

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

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
❌	Memory	resolver[resolve from symlinks multi thread]	672.5 KB	11,822.3 KB	-94.31%
⚡	Simulation	resolver[multi-thread]	71 ms	63.7 ms	+11.4%
⚡	Simulation	resolver[single-thread]	63.4 ms	56.9 ms	+11.42%

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_{Comparing chore/bench-use-mimalloc (e4d84d9) with main (3d32523)}