[WIP] Fix ban by software version, some other under-hood changes

- Use updated version of upstream go-xmpp + fixes on client-side
- Still waiting for https://github.com/xmppo/go-xmpp/pull/215
- Introduce golangci-lint v2 + fixes

go.mod

@@ -4,15 +4,11 @@ go 1.24.3
 
 require (
 	github.com/davecgh/go-spew v1.1.1
-	github.com/eleksir/go-xmpp v1.6.0
 	github.com/google/uuid v1.6.0
 	github.com/hjson/hjson-go v3.3.0+incompatible
 	github.com/jbrukh/bayesian v0.0.0-20231117143245-13ae6f916c7a
+	github.com/xmppo/go-xmpp v0.2.19-0.20251123101827-6986f11d85b8
 	gopkg.in/tomb.v2 v2.0.0-20161208151619-d5d1b5820637
 )
 
-require (
-	golang.org/x/crypto v0.38.0 // indirect
-	golang.org/x/net v0.40.0 // indirect
-	golang.org/x/text v0.25.0 // indirect
-)
+require golang.org/x/net v0.47.0 // indirect