pip: bump regex from 2023.3.23 to 2023.5.5

Bumps [regex](https://github.com/mrabarnett/mrab-regex) from 2023.3.23 to 2023.5.5.
- [Release notes](https://github.com/mrabarnett/mrab-regex/releases)
- [Changelog](https://github.com/mrabarnett/mrab-regex/blob/hg/changelog.txt)
- [Commits](mrabarnett/mrab-regex@2023.3.23...2023.5.5)

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

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

Author: dependabot[bot]

requirements.txt

@@ -15,7 +15,7 @@ pomerge==0.1.4
 pospell==1.1
 powrap==1.0.1
 Pygments==2.15.1
-regex==2023.3.23
+regex==2023.5.5
 requests==2.29.0
 snowballstemmer==2.2.0
 Sphinx==5.3.0