Bump regex from 2026.4.4 to 2026.5.9 in the python-requirements group

Bumps the python-requirements group with 1 update: [regex](https://github.com/mrabarnett/mrab-regex).


Updates `regex` from 2026.4.4 to 2026.5.9
- [Changelog](https://github.com/mrabarnett/mrab-regex/blob/hg/changelog.txt)
- [Commits](mrabarnett/mrab-regex@2026.4.4...2026.5.9)

---
updated-dependencies:
- dependency-name: regex
  dependency-version: 2026.5.9
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: python-requirements
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -16,7 +16,7 @@ dependencies = [
     "markdownify>=1.2.2",
     "mistune>=3.2.1",
     "psycopg2>=2.9.12",
-    "regex>=2026.2.28",
+    "regex>=2026.5.9",
     "sentry-sdk[pure-eval]>=2.59.0",
     "yarl>=1.23.0",
 ]