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

level=WARN msg="command failed" error="invalid color mode \"xxx\": must be one of: never, auto, always"

Seems to be related to this bug.

The recommendation is to set the HELM_DIFF_COLOR variable instead of the --color parameter