Bump regex from 2021.7.6 to 2021.8.3

Bumps [regex](https://bitbucket.org/mrabarnett/mrab-regex) from 2021.7.6 to 2021.8.3.
- [Commits](https://bitbucket.org/mrabarnett/mrab-regex/commits)

---
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

@@ -18,7 +18,7 @@ mypy-extensions==0.4.3
 pathspec==0.9.0
 pylint==2.9.5
 pyTelegramBotAPI==3.8.2
-regex==2021.7.6
+regex==2021.8.3
 requests==2.26.0
 toml==0.10.2
 tomli==1.2.1