fix: Fix AttributeError on missing process method in slixmpp

This commit resolves an `AttributeError` when starting the `SovereignBridge`
class due to the missing `process` method. Newer versions of `slixmpp` (1.8+)
leverage the standard `asyncio` loop directly and no longer provide the
legacy `process(forever=True)` wrapper.

The bridge now correctly starts the XMPP client by calling
`xmpp.loop.run_forever()` directly after `xmpp.connect()`.

Co-authored-by: jamessucla <2191476+jamessucla@users.noreply.github.com>

bridge.py

@@ -107,7 +107,7 @@ def main():
 
     logging.info("Connecting to XMPP server...")
     xmpp.connect()
-    xmpp.process(forever=True)
+    xmpp.loop.run_forever()
 
 if __name__ == '__main__':
     main()

test.nix

@@ -0,0 +1,9 @@
+{ pkgs ? import <nixpkgs> {} }:
+let
+  pythonEnv = pkgs.python3.withPackages (ps: with ps; [
+    slixmpp
+  ]);
+in
+pkgs.mkShell {
+  buildInputs = [ pythonEnv ];
+}