Mcdoc simplified type caches are not cleared when changing versions

[misode]

How to reproduce

1. Create an empty workspace with a single pack.mcmeta version in it:

{
  "pack": {
    "description": {
      "text": "My data pack",
      "shadow_color": 123
    },
    "pack_format": 61
  }
}

2. Reload the window so 1.21.4 is currently loaded and reset the project cache to make sure the cache is clean
3. ✅ Notice that the shadow_color field added in 1.21.4 is correctly recognized
4. Replace pack format 61 with 57 to select 1.21.3 as loaded version
5. Reload the window and wait until initialization is done
6. ❌ Notice that there is no "unknown key" warning for the shadow_color field, even after closing and reopening the file
7. Reset the project cache
8. ✅ Now there is an "unknown key" warning

Analysis

Since the mcdoc symbols are being contributed by the @vanilla-mcdoc dependency, their cache is only cleared when the hashes of those files change (when a new version of vanilla-mcdoc is pushed to the repo), not when the currently loaded version is changed.

The since and until attributes do not cause a type to be marked as "having dynamic data" (with good reason, otherwise almost none of the types could get simplified), however this means that the cached simplified types need to be cleared when changing versions.