Update/Fix standard library dependency

[yerTools]

Hi,

The Gleam standard library has been updated, and the gleam/regex module has been removed.
If you use Feather as a dependency with the latest standard library, compilation will fail.

To address this issue, the following changes have been made:

• Updated gleam_stdlib to version 0.51.0.
• Added gleam_regexp to replace the removed gleam/regex module.
• Replaced deprecated result.nil_error with result.replace_error.

Thank you very much,
- Felix :)