Toolchain submodule update

[r-n-o]

This branch updates the toolchain submodule to make make dist work correctly. I got the following error when running locally from a fresh directory:

$ make dist
rm -rf dist/*
/Library/Developer/CommandLineTools/usr/bin/make toolchain-clean default
chmod -R u+w cache
chmod: cache: No such file or directory
make[1]: *** [toolchain-clean] Error 1
make: *** [dist] Error 2

I verified that the error is gone after the submodule bump. This is because toolchain is now checking for the existence of the cache dir before deleting it: https://codeberg.org/distrust/toolchain/src/commit/4eff8b258b1e9bc64f3d831ae160ac9256bfdd79/Makefile#L90-L93