Bump mistune from 2.0.2 to 2.0.3

Bumps [mistune](https://github.com/lepture/mistune) from 2.0.2 to 2.0.3.
- [Release notes](https://github.com/lepture/mistune/releases)
- [Changelog](https://github.com/lepture/mistune/blob/master/docs/changes.rst)
- [Commits](https://github.com/lepture/mistune/compare/v2.0.2...v2.0.3

)

---
updated-dependencies:
- dependency-name: mistune
  dependency-type: direct:production
...

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

requirements.txt

@@ -38,7 +38,7 @@ drf-yasg==1.20.0
 environs==9.5.0
 gunicorn==20.1.0
 mailchimp3==3.0.16
-mistune==2.0.2
+mistune==2.0.3
 more-itertools==8.12.0
 phonenumberslite==8.12.39
 Pillow==9.0.1