Rename filename to path in WASI EventLoop#open (#16636)

Author: kojix2

src/crystal/event_loop/wasi.cr

@@ -43,7 +43,7 @@ class Crystal::EventLoop::Wasi < Crystal::EventLoop
     raise NotImplementedError.new("Crystal::EventLoop::Wasi#pipe")
   end
 
-  def open(filename : String, flags : Int32, permissions : File::Permissions, blocking : Bool?) : {System::FileDescriptor::Handle, Bool} | Errno | WinError
+  def open(path : String, flags : Int32, permissions : File::Permissions, blocking : Bool?) : {System::FileDescriptor::Handle, Bool} | Errno | WinError
     raise NotImplementedError.new("Crystal::Wasi::EventLoop#open")
   end