Update dnspython requirement from ==2.7.* to ==2.8.* (#5770)

Updates the requirements on [dnspython](https://github.com/rthalley/dnspython) to permit the latest version.
- [Release notes](https://github.com/rthalley/dnspython/releases)
- [Changelog](https://github.com/rthalley/dnspython/blob/main/doc/whatsnew.rst)
- [Commits](https://github.com/rthalley/dnspython/compare/v2.7.0rc1...v2.8.0)

---
updated-dependencies:
- dependency-name: dnspython
  dependency-version: 2.8.0
  dependency-type: direct:production
...

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pyproject.toml

@@ -56,7 +56,7 @@ dependencies = [
   "django-scopes==2.0.*",
   "django-statici18n==2.6.*",
   "djangorestframework==3.16.*",
-  "dnspython==2.7.*",
+  "dnspython==2.8.*",
   "drf_ujson2==1.7.*",
   "geoip2==5.*",
   "importlib_metadata==8.*",  # Polyfill, we can probably drop this once we require Python 3.10+