Micha Reiser cba197e3c5 [red-knot] Default playground to Python 3.13 for real (#16956) ...

## Summary

Default to 3.13 for good. 

I incorrectly used `workspace.updateOptions` instead of `updateOptions`
where the latter has a fallback.

## Test Plan

```py
import os

import sys

reveal_type(sys.version_info.minor)
```

reveals 13 on initial page load

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..

public

Red Knot Playground (#12681)

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src

[red-knot] Default playground to Python 3.13 for real (#16956)

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index.html

Red Knot Playground (#12681)

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package.json

Red Knot Playground (#12681)

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vite.config.ts

Red Knot Playground (#12681)

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