[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

internal/jabber/query_version.go

@@ -4,8 +4,8 @@ import (
 	"buny-jabber-bot/internal/log"
 	"fmt"
 
-	"github.com/eleksir/go-xmpp"
 	"github.com/google/uuid"
+	"github.com/xmppo/go-xmpp"
 )
 
 // QuerySoftwareVersion запрошивает версию и название клиента.