fix parse_config for asyncssh>=2.19.0

Also deprecate the function and raise a warning when it is used.

Co-authored-by: Sailesh <58628378+99-NinetyNine@users.noreply.github.com>

Author: 99-NinetyNine

sshfs/config.py

@@ -1,29 +1,49 @@
 import getpass
 from contextlib import suppress
 from pathlib import Path
+import warnings
+import asyncssh
 
 from asyncssh.config import SSHClientConfig
 
 SSH_CONFIG = Path("~", ".ssh", "config").expanduser()
 
 
-def parse_config(
-    *, host, user=(), port=(), local_user=None, config_files=None
-):
+def parse_config(*, host, user=(), port=(), local_user=None, config_files=None):
+    warnings.warn(
+        "parse_config is deprecated and will be removed in the future.",
+        DeprecationWarning,
+    )
+
     if config_files is None:
         config_files = [SSH_CONFIG]
 
     if local_user is None:
-        with suppress(KeyError):
+        with suppress(KeyError, OSError):
             local_user = getpass.getuser()
 
     last_config = None
     reload = False
 
+    version = tuple(map(int, asyncssh.__version__.split(".")))
+    if version < (2, 19, 0):
+        return SSHClientConfig.load(
+            last_config,
+            config_files,
+            reload,
+            local_user,
+            user,
+            host,
+            port,
+        )
+    canonical = False
+    final = False
     return SSHClientConfig.load(
         last_config,
         config_files,
         reload,
+        canonical,
+        final,
         local_user,
         user,
         host,