[libcxx] Update picolibc version and remove xfails due to picolibc's support for char16_t and char32_t#114422

vhscampos wants to merge 2 commits intollvm:mainllvm/llvm-project:mainfrom

vhscampos:libcxx-picolibc-char-remove-xfailsvhscampos/llvm-project:libcxx-picolibc-char-remove-xfailsCopy head branch name to clipboard