GHSA-6MW6-MJ76-GRWC gix-date can create non-utf8 string with `TimeBuf::as_str`

The function gixdate::parse::TimeBuf::asstr can create an illegal string containing non-utf8 characters. This violates the safety invariant of TimeBuf and can lead to undefined behavior when consuming the string. The bug can be prevented by adding str::fromutf8 to the function TimeBuf::write...

RUSTSEC-2025-0140 Non-utf8 String can be created with `TimeBuf::as_str`

The function gixdate::parse::TimeBuf::asstr can create an illegal string containing non-utf8 characters. This violates the safety invariant of TimeBuf and can lead to undefined behavior when consuming the string. The bug can be prevented by adding str::fromutf8 to the function TimeBuf::write...