Bump kubernetes from 25.3.0 to 26.1.0 in /tests (#3570)

Bumps [kubernetes](https://github.com/kubernetes-client/python) from 25.3.0 to 26.1.0.
- [Release notes](https://github.com/kubernetes-client/python/releases)
- [Changelog](https://github.com/kubernetes-client/python/blob/master/CHANGELOG.md)
- [Commits](kubernetes-client/python@v25.3.0...v26.1.0)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

tests/requirements.txt

@@ -249,9 +249,9 @@ iniconfig==2.0.0 \
     # via
     #   -r requirements.txt
     #   pytest
-kubernetes==25.3.0 \
-    --hash=sha256:213befbb4e5aed95f94950c7eed0c2322fc5a2f8f40932e58d28fdd42d90836c \
-    --hash=sha256:eb42333dad0bb5caf4e66460c6a4a1a36f0f057a040f35018f6c05a699baed86
+kubernetes==26.1.0 \
+    --hash=sha256:5854b0c508e8d217ca205591384ab58389abdae608576f9c9afc35a3c76a366c \
+    --hash=sha256:e3db6800abf7e36c38d2629b5cb6b74d10988ee0cba6fba45595a7cbe60c0042
     # via -r requirements.txt
 mock==5.0.1 \
     --hash=sha256:c41cfb1e99ba5d341fbcc5308836e7d7c9786d302f995b2c271ce2144dece9eb \