mise-action cannot upgrade mise

[bhollis]

I expect that if I set version in this action, that's the version that will be installed. Instead, as long as there is any file in ~/.local/share/mise/bin/mise, this action does nothing:

Run jdx/mise-action@v2
  with:
    install: false
    cache: false
    version: 2025.1.1
    log_level: debug
    cache_save: true
    cache_key_prefix: mise-v0
    experimental: false
Setting env vars
  Setting MISE_LOG_LEVEL=debug
  Setting MISE_TRUSTED_CONFIG_PATHS=/home/penguin/actions-runner/_work/stately/stately
  Setting MISE_YES=1
  Adding /home/penguin/.local/share/mise/shims to PATH
Running mise --version
  /home/penguin/.local/share/mise/bin/mise --version
  2024.10.4 linux-x64 (6c21c0a 2024-10-14)

In this case I wanted 2025.1.1 but I have 2024.10.4 installed. I would need to manually uninstall in order to get a different version. It's clear to see why this happens - setupMise only installs if the binary is missing. This probably works fine for ephemeral GitHub runners that start anew every time, but when using self-hosted runners that keep their state between runs, it means we can't install a specific mise version through this action.

To fix, the action should not only check if the file exists, but check that it is the desired version.