Bump python-subunit from 1.4.3 to 1.4.4

Bumps [python-subunit](https://github.com/testing-cabal/subunit) from 1.4.3 to 1.4.4.
- [Release notes](https://github.com/testing-cabal/subunit/releases)
- [Changelog](https://github.com/testing-cabal/subunit/blob/master/NEWS)
- [Commits](testing-cabal/subunit@1.4.3...1.4.4)

---
updated-dependencies:
- dependency-name: python-subunit
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -34,7 +34,7 @@ python-mimeparse==1.6.0
 fixtures==4.1.0
 testtools==2.7.1
 testscenarios==0.5.0
-python-subunit==1.4.3
+python-subunit==1.4.4
 coverage==7.3.2
 pyasn1==0.5.0