vendor: update to the latest systemd_ctypes

We didn't sync this in a while and there have been a lot of changes.

We also have a critical bug fix included: we recently introduced a test
case (in 0bb7438) which triggers a
segfault in the binding layer of systemd_ctypes due to FFI call
trampolines being garbage collected while they're still running.

This is currently blocking downstream packaging on several non-x86_64
architectures.

src/cockpit/channels/filesystem.py

@@ -31,6 +31,7 @@
 
 from cockpit._vendor.systemd_ctypes import Handle, PathWatch
 from cockpit._vendor.systemd_ctypes.inotify import Event as InotifyEvent
+from cockpit._vendor.systemd_ctypes.pathwatch import Listener as PathWatchListener
 
 from ..channel import Channel, ChannelError, GeneratorChannel
 from ..jsonutil import (
@@ -298,7 +299,7 @@ class Follow(enum.Enum):
     YES = True
 
 
-class FsInfoChannel(Channel):
+class FsInfoChannel(Channel, PathWatchListener):
     payload = 'fsinfo'
 
     # Options (all get set in `do_open()`)