Update default tls config to 1.3 for mgmt operations

[fgiorgetti]

Is your feature request related to a problem? Please describe. Internally, there is a method used to configure the TLS Config that uses TLS1.0 by default. Change it so it uses a safer 1.3 verison. Here is the reference: https://github.com/skupperproject/skupper/blob/378e79287c9ca0a7f6c7eb48051a435b661a5c39/internal/nonkube/client/runtime/certs.go#L78

[c-kruse]

When I had looked into doing this for the network observer, I think we found that back to the very beginning every skupper router build we've published has supported TLS 1.3 (ubi/rhel 8 based images).