chore(deps): update docker.io/alpine/helm docker tag to v3.15.4

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
docker.io/alpine/helm	stage	patch	3.15.3 -> 3.15.4

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[renovate]

Branch automerge failure

This PR was configured for branch automerge. However, this is not possible, so it has been raised as a PR instead.