chore(deps): update rust crate regex to v1.12.4 (#295)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [regex](https://redirect.github.com/rust-lang/regex) | dependencies |
patch | `1.12.3` → `1.12.4` |

---

### Release Notes

<details>
<summary>rust-lang/regex (regex)</summary>

###
[`v1.12.4`](https://redirect.github.com/rust-lang/regex/blob/HEAD/CHANGELOG.md#1124-2025-06-09)

[Compare
Source](https://redirect.github.com/rust-lang/regex/compare/1.12.3...1.12.4)

\===================
This release includes a performance optimization for compilation of
regexes
with very large character classes.

Improvements:

- [#&#8203;1308](https://redirect.github.com/rust-lang/regex/pull/1308):
Avoid re-canonicalizing the entire interval set when pushing new class
ranges.

</details>

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