Auto merge of rust-lang#132714 - mati865:update-memchr, r=tgross35

unpin and update memchr

I'm unable to build x86_64-pc-windows-gnu Rust due to some weird binutils bug, but thinlto issue seems to be no longer present. Let's give it a go on the CI.
Possibly fixed by rust-lang#129079

Fixes rust-lang#127890

Author: bors