pip: bump regex from 2023.6.3 to 2023.8.8

Bumps [regex](https://github.com/mrabarnett/mrab-regex) from 2023.6.3 to 2023.8.8.
- [Changelog](https://github.com/mrabarnett/mrab-regex/blob/hg/changelog.txt)
- [Commits](mrabarnett/mrab-regex@2023.6.3...2023.8.8)

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

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

requirements.txt

@@ -14,7 +14,7 @@ pomerge==0.1.4
 pospell==1.3
 powrap==1.0.1
 Pygments==2.16.1
-regex==2023.6.3
+regex==2023.8.8
 requests==2.31.0
 snowballstemmer==2.2.0
 Sphinx==6.0.1