config: add support for testnet4

[calvinrzachman]

• We have support for testnet4 in btcd library. https://github.com/btcsuite/btcd/blob/master/chaincfg/params.go#L732
• We probably need to upgrade our lndclient library: https://github.com/lightninglabs/lndclient/blob/v0.18.0-6/network.go#L12

TODO

• Update lndclient to handle connection to a testnet4 lnd node.

[calvinrzachman]

Bumping the lndclient dependency necessitated a Go version change and update to the log setup. I'm not entirely sure the best way to setup logs using the new changes to lnd log related libraries, but built an image and confirmed that the changes to log setup are at least functional:

➜  kind-regtest ✗ kubectl logs -f bob-54c96b989d-mtj7t -c lndmon
2025-04-24 12:42:36.056 [INF] LNDMON: Starting Prometheus exporter...
2025-04-24 12:42:36.056 [INF] HTLC: Starting Htlc Monitor
2025-04-24 12:42:36.056 [INF] PMNT: Starting payments monitor...
2025-04-24 12:42:36.056 [INF] LNDMON: Prometheus active!
^C
➜  kind-regtest ✗ kubectl get deploy bob -o yaml | grep image: | grep lndmon
        image: czachman/lndmon:v0.0.5-dev-testnet4

[guggero]

LGTM 🎉

I think we can make the log configurable at a later time.