Bump azure/setup-helm from 3.5 to 4

Bumps [azure/setup-helm](https://github.com/azure/setup-helm) from 3.5 to 4.
- [Release notes](https://github.com/azure/setup-helm/releases)
- [Changelog](https://github.com/Azure/setup-helm/blob/main/CHANGELOG.md)
- [Commits](Azure/setup-helm@v3.5...v4)

---
updated-dependencies:
- dependency-name: azure/setup-helm
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/tests.yaml

@@ -32,7 +32,7 @@ jobs:
       - uses: azure/setup-kubectl@v3.2
         with:
           version: ${{ steps.k3d.outputs.k8s-version }}
-      - uses: azure/setup-helm@v3.5
+      - uses: azure/setup-helm@v4
       - name: Helm lint
         run: helm lint shinyproxy
       - name: Helm install