Use helm 3.8.0

[slushysnowman]

Description

Currently the provider is using helm 3.7.2, but helm 3.8.0 is now released - currently we're having to prevent upgrading our local helm version due to mismatch in how these two versions of helm operate when it comes to pulling OCI charts from private registries. (we're having to use null resources to login to private registries to pull OCI charts).

It would be good if the provider is updated to use the latest version of helm as well.

[github-actions]

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