Add note about NVM and latest release syntax being outdated

Closes #1236 
Closes #1114
Closes #940

As extensively documented in #1236 and #940, the non-exact aliases `lts/*`, `*`, `current`, `latest`, and `22` are slow to be upgraded, lagging several days behind the Node.js releases.

Let users know about this downside.
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Karl Horky 2025-08-02 15:38:32 +02:00 committed by GitHub
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@ -123,7 +123,7 @@ Examples:
- NVM LTS syntax: `lts/erbium`, `lts/fermium`, `lts/*`, `lts/-n`
- Latest release: `*` or `latest`/`current`/`node`
**Note:** Like the other values, `*` will get the latest [locally-cached Node.js version](https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2204-Readme.md#nodejs), or the latest version from [actions/node-versions](https://github.com/actions/node-versions/blob/main/versions-manifest.json), depending on the [`check-latest`](docs/advanced-usage.md#check-latest-version) input.
**Note:** If you require timely version upgrades, use specific versions like `22.18.0` and upgrade the versions yourself. Values like `lts/*`, `*`, `latest`, etc. will get the latest [locally-cached Node.js version](https://github.com/actions/runner-images/blob/main/images/ubuntu/Ubuntu2204-Readme.md#nodejs), or the latest version from [actions/node-versions](https://github.com/actions/node-versions/blob/main/versions-manifest.json), depending on the [`check-latest`](docs/advanced-usage.md#check-latest-version) input. Both can be several days outdated.
`current`/`latest`/`node` always resolve to the latest [dist version](https://nodejs.org/dist/index.json).
That version is then downloaded from actions/node-versions if possible, or directly from Node.js if not.