bump libc version for uclibc fixes

[skrap]

closes #95866

The required functions have been added to libc in rust-lang/libc#2750. That change made it into libc 0.2.124, but this just takes the latest libc.

[rust-highfive]

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[rust-highfive]

r? @Mark-Simulacrum

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[JohnTitor]

Thanks!
r? @JohnTitor @bors r+

[bors]

📌 Commit c81734f has been approved by JohnTitor

[klensy]

Already updated in #96510

[GuillaumeGomez]

Indeed.

@bors: r-

[JohnTitor]

Good catch! Closing in favor of it.