Bump regex from 2025.7.34 to 2025.9.18

Bumps [regex](https://github.com/mrabarnett/mrab-regex) from 2025.7.34 to 2025.9.18.
- [Changelog](https://github.com/mrabarnett/mrab-regex/blob/hg/changelog.txt)
- [Commits](mrabarnett/mrab-regex@2025.7.34...2025.9.18)

---
updated-dependencies:
- dependency-name: regex
  dependency-version: 2025.9.18
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements-tests.txt

@@ -13,7 +13,7 @@ pytest-asyncio
 pytest-cov >= 2.12.0,< 6.0.0
 python-multipart >= 0.0.5
 python-socketio
-regex==2025.7.34
+regex==2025.9.18
 ruff ==0.6.3
 types-dataclasses ==0.6.6
 types-orjson ==3.6.2