gRPC WithBlock is deprecated

[salasberryfin]

Description

Etcd NewClient uses the gRPC call WithBlock, which has now been deprecated and is considered an anti-pattern:

cluster-api-provider-rke2/pkg/etcd/etcd.go

Lines 152 to 155 in c168294

	DialOptions: []grpc.DialOption{
	grpc.WithBlock(), // block until the underlying connection is up
	grpc.WithContextDialer(dialer.DialContextWithAddr),
	},

More information on why this is the case can be found in the grpc-go documentation here