Bump idna from 3.7 to 3.8

Bumps [idna](https://github.com/kjd/idna) from 3.7 to 3.8.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.7...v3.8)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -6,7 +6,7 @@ colorama==0.4.6
 ghp-import==2.1.0
 gitdb==4.0.11
 GitPython==3.1.43
-idna==3.7
+idna==3.8
 Jinja2==3.1.4
 Markdown==3.6
 MarkupSafe==2.1.5