Fix spurious async

Author: krassowski

jupyter_client/provisioning/local_provisioner.py

@@ -223,7 +223,7 @@ async def launch_kernel(self, cmd: List[str], **kwargs: Any) -> KernelConnection
         self.cwd = kwargs.get("cwd", pathlib.Path.cwd())
         return self.connection_info
 
-    async def resolve_path(self, path_str: str) -> Optional[str]:
+    def resolve_path(self, path_str: str) -> Optional[str]:
         """Resolve path to given file."""
         path = pathlib.Path(path_str).expanduser()
         if not path.is_absolute() and self.cwd: