README: update actions/checkout to v3

actions/checkout@v2 uses node v12 which is deprecated, so better to use the current version for anyone who copies and pastes this example
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David Lechner 2022-10-17 12:06:31 -05:00 committed by GitHub
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@ -28,7 +28,7 @@ See [action.yml](action.yml)
```yaml
steps:
- uses: actions/checkout@v2
- uses: actions/checkout@v3
- run: mkdir -p path/to/artifact