Bump azure/setup-kubectl from 3.2 to 4 (#117)

Bumps [azure/setup-kubectl](https://github.com/azure/setup-kubectl) from 3.2 to 4.
- [Release notes](https://github.com/azure/setup-kubectl/releases)
- [Changelog](https://github.com/Azure/setup-kubectl/blob/main/CHANGELOG.md)
- [Commits](Azure/setup-kubectl@v3.2...v4)

---
updated-dependencies:
- dependency-name: azure/setup-kubectl
  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>

.github/workflows/tests.yaml

@@ -29,7 +29,7 @@ jobs:
         with: 
           version: ${{ matrix.K3S_VERSION }}
           k3d-args: -p 8000:80@loadbalancer
-      - uses: azure/setup-kubectl@v3.2
+      - uses: azure/setup-kubectl@v4
         with:
           version: ${{ steps.k3d.outputs.k8s-version }}
       - uses: azure/[email protected]