Unsupported resource file version
I'm trying out a pyxres file of mine using the web version here: `https://kitao.github.io/pyxel/?edit=`
The file seems to load but with this error?

```
Traceback (most recent call last):
  File "/lib/python3.10/_pyodide/_base.py", line 460, in eval_code
    .run(globals, locals)
  File "/lib/python3.10/_pyodide/_base.py", line 304, in run
    coroutine = eval(self.code, globals, locals)
  File "", line 1, in 
  File "/home/pyodide/pyxel/cli.py", line 134, in edit_pyxel_resource
    pyxel.editor.App(pyxel_resource_file)
  File "/home/pyodide/pyxel/editor/app.py", line 45, in __init__
    pyxel.load(resource_file)
pyo3_runtime.PanicException: Unsupported resource file version '1.8.9'
```

I installed 1.8.9 some days ago and I suspect that the web player either is out of date or uses the newer 1.8.10 version?
More importantly, how can I upgrade my resource files to work with a newer version?