Bump kubernetes from 19.15.0b1 to 20.11.0a1 in /tests

Bumps [kubernetes](https://github.com/kubernetes-client/python) from 19.15.0b1 to 20.11.0a1.
- [Release notes](https://github.com/kubernetes-client/python/releases)
- [Changelog](https://github.com/kubernetes-client/python/blob/master/CHANGELOG.md)
- [Commits](kubernetes-client/python@v19.15.0b1...v20.11.0a1)

---
updated-dependencies:
- dependency-name: kubernetes
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

tests/requirements.txt

@@ -1,7 +1,7 @@
 PyYAML==5.4.1
 requests==2.26.0
 forcediphttpsadapter==1.0.1
-kubernetes==19.15.0b1
+kubernetes==20.11.0a1
 pytest==6.2.5
 ipaddress==1.0.23 # >= 1.0.17
 cffi==1.15.0