helm diff job fails with helm 4
## Describe the bug The `helm-diff-xxx` jobs do not work with Helm 4. ## Expected behavior The `helm-diff-xxx` jobs should work with both Helm 3 and Helm 4. ## Actual behavior ```bash level=WARN msg="command failed" error="invalid color mode \"xxx\": must be one of: never, auto, always" ``` Seems to be related to [this](https://github.com/databus23/helm-diff/issues/880) bug. The recommendation is to set the `HELM_DIFF_COLOR` variable instead of the `--color` parameter
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