chore(deps): update dnspython requirement in /test/e2e2

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/v2.4.1...v2.4.2)

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

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

test/e2e2/requirements.txt

@@ -2,4 +2,4 @@ pytest
 pytest-schema
 pytest-xdist
 requests
-dnspython~=2.4.1
+dnspython~=2.4.2