Bump idna from 3.7 to 3.8 (#1222)

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] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -13,7 +13,7 @@ fastapi==0.112.0
 fastapi-csrf-protect==0.3.4
 freezegun==1.5.1
 h11==0.14.0
-idna==3.7
+idna==3.8
 Jinja2==3.1.4
 karton-core==5.4.0
 git+https://github.com/CERT-Polska/mailgoose@v1.3.3#egg=libmailgoose&subdirectory=scan