Update libc:musl to support loongarch64

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.7%. Comparing base (4a74924) to head (20c9006). Report is 39 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #682 +/- ## ======================================= - Coverage 97.8% 97.7% -0.1% ======================================= Files 81 83 +2 Lines 9378 8996 -382 ======================================= - Hits 9169 8789 -380 + Misses 209 207 -2 ```

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[jhpratt]

This serves no purpose. Cargo.lock is only used during the development of the crate. Any downstream user completely ignores it.