Fix for new python-3.13

[UffeJakobsen]

Fix for new python-3.13

After Archlinux updating python from 3.12.7-1 to 3.13.1-1 the following error prevented catapult from starting:

Traceback (most recent call last):
  File "/usr/local/share/catapult/catapult/app.py", line 40, in _on_activate
    window = catapult.Window()
  File "/usr/local/share/catapult/catapult/window.py", line 91, in __init__
    self.load_css()
    ~~~~~~~~~~~~~^^
  File "/usr/local/share/catapult/catapult/window.py", line 235, in load_css
    catapult.util.load_theme(catapult.conf.theme),
    ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/share/catapult/catapult/util.py", line 143, in load_theme
    uri = path_to_uri(path)
  File "/usr/local/share/catapult/catapult/util.py", line 160, in path_to_uri
    return "file://{}".format(urllib.parse.quote(path))
                              ^^^^^^^^^^^^
AttributeError: module 'urllib' has no attribute 'parse'

[otsaloma]

Thanks! Interestingly, I can't reproduce this error. On my Debian the default is still Python 3.12, but I also have 3.13.1 and could test this manually. But, the fix does look correct, that's how I've seen urllib.parse usually used.