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Actually use jemalloc (#10269) 

The uv-performance-memory-allocator is currently optimized out at least
on musl due to the crate being otherwise unused
(https://github.com/rust-lang/rust/issues/64402), causing musl to not
use jemalloc and being slow.

Command:
```
cargo build --target x86_64-unknown-linux-musl --profile profiling
hyperfine --warmup 1 --runs 10 --prepare "uv venv -p 3.12" "target/x86_64-unknown-linux-musl/profiling/uv pip compile scripts/requirements/airflow.in"
```

Before:
```
Time (mean ± σ):      1.149 s ±  0.013 s    [User: 1.498 s, System: 0.433 s]
Range (min … max):    1.131 s …  1.173 s    10 runs
```

After:
```
Time (mean ± σ):     552.6 ms ±   4.7 ms    [User: 771.7 ms, System: 197.5 ms]
Range (min … max):   546.4 ms … 561.6 ms    10 runs
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konsti 2025-01-02 16:03:14 +01:00 committed by GitHub
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commit a3307d91a3
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crates/uv/src/bin/uv.rs
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@ -1,3 +1,7 @@
// Don't optimize the alloc crate away due to it being otherwise unused.
// https://github.com/rust-lang/rust/issues/64402
extern crate uv_performance_memory_allocator;
use std::process::ExitCode;
use uv::main as uv_main;