Update dnspython requirement from ==2.3.* to ==2.5.* (#3917)

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/master/doc/whatsnew.rst)
- [Commits](https://github.com/rthalley/dnspython/compare/v2.3.0rc1...v2.5.0)

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

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pyproject.toml

@@ -56,7 +56,7 @@ dependencies = [
   "django-scopes==2.0.*",
   "django-statici18n==2.4.*",
   "djangorestframework==3.14.*",
-  "dnspython==2.3.*",
+  "dnspython==2.5.*",
   "drf_ujson2==1.7.*",
   "geoip2==4.*",
   "importlib_metadata==7.*",  # Polyfill, we can probably drop this once we require Python 3.10+