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	Update README.md to update default Node version to 20 (#949)
The README's default example for setting up Node use version 16, which is at end of life. This PR updates those examples to use 20.
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		@@ -103,7 +103,7 @@ The `node-version` input supports the Semantic Versioning Specification, for mor
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Examples:
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 - Major versions: `16`, `18`, `20`
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 - Major versions: `18`, `20`
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 - More specific versions: `10.15`, `16.15.1` , `18.4.0`
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 - NVM LTS syntax: `lts/erbium`, `lts/fermium`, `lts/*`, `lts/-n`
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 - Latest release: `*` or `latest`/`current`/`node`
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@@ -135,7 +135,7 @@ steps:
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- uses: actions/checkout@v4
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- uses: actions/setup-node@v4
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  with:
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    node-version: 16
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    node-version: 20
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    cache: 'npm'
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- run: npm ci
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- run: npm test
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@@ -148,7 +148,7 @@ steps:
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- uses: actions/checkout@v4
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- uses: actions/setup-node@v4
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  with:
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    node-version: 16
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    node-version: 20
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    cache: 'npm'
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    cache-dependency-path: subdir/package-lock.json
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- run: npm ci
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@@ -185,7 +185,7 @@ To get a higher rate limit, you can [generate a personal access token on github.
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uses: actions/setup-node@v4
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with:
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  token: ${{ secrets.GH_DOTCOM_TOKEN }}
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  node-version: 16
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  node-version: 20
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```
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If the runner is not able to access github.com, any Nodejs versions requested during a workflow run must come from the runner's tool cache. See "[Setting up the tool cache on self-hosted runners without internet access](https://docs.github.com/en/enterprise-server@3.2/admin/github-actions/managing-access-to-actions-from-githubcom/setting-up-the-tool-cache-on-self-hosted-runners-without-internet-access)" for more information.
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