suggest helm v3.13.1+ in the quickstart

[krancour]

Helm v3.13.0 (specifically) has difficulty anonymously pulling charts from OCI registries.

It usually manifests as something like this:

failed to authorize: failed to fetch anonymous token: unexpected status
from GET request to https://auth.docker.io/token?scope=repository%3AXXX%2FYYY%3Apull&service=registry.docker.io:
401 Unauthorized

If you're logged into ghcr.io, the issue doesn't occur.

Rather than say "don't use v3.13.0," we should probably just suggest using v3.13.1+

Ref: helm/helm#12424

Thanks to @34fathombelow for helping to uncover this.