win/mac build: bump pyinstaller (5.11.0->5.13.2)

- needed for bumping python version, as 3.11+ is borked without https://github.com/pyinstaller/pyinstaller/issues/7692
- plugin.py: adapt to pyinstaller 5.12+
    loader was renamed in https://github.com/pyinstaller/pyinstaller/commit/b9111db8a869dd19dd7e8b3c952abea3238d02a6

electrum/plugin.py

@@ -97,7 +97,7 @@ class Plugins(DaemonThread):
             # FIXME pyinstaller binaries are packaging each built-in plugin twice:
             #       once as data and once as code. To honor the "no duplicates" rule below,
             #       we exclude the ones packaged as *code*, here:
-            if loader.__class__.__qualname__ == "FrozenImporter":
+            if loader.__class__.__qualname__ == "PyiFrozenImporter":
                 continue
             full_name = f'electrum.plugins.{name}'
             spec = importlib.util.find_spec(full_name)