Bump dnspython from 2.0.0 to 2.6.1 in /requirements

Bumps [dnspython](https://github.com/rthalley/dnspython) from 2.0.0 to 2.6.1.
- [Release notes](https://github.com/rthalley/dnspython/releases)
- [Changelog](https://github.com/rthalley/dnspython/blob/main/doc/whatsnew.rst)
- [Commits](rthalley/dnspython@v2.0.0...v2.6.1)

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

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

requirements/requirements.dev.generated.txt

@@ -164,7 +164,7 @@ djangorestframework==3.15.1
     #   drf-yasg
 djangorestframework-csv==3.0.2
 djangorestframework-jsonp==1.0.2
-dnspython==2.0.0
+dnspython==2.6.1
     # via ipwhois
 docutils==0.16
     # via

requirements/requirements.linux.generated.txt

@@ -164,7 +164,7 @@ djangorestframework==3.15.1
     #   drf-yasg
 djangorestframework-csv==3.0.2
 djangorestframework-jsonp==1.0.2
-dnspython==2.0.0
+dnspython==2.6.1
     # via ipwhois
 docutils==0.16
     # via