Use newer `actions/checkout` version to avoid Node12 deprecation

cmu-delphi / forecast-eval

delphi.cmu.edu/forecast-eval

MIT License

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Closed nmdefries closed 1 year ago

nmdefries commented 1 year ago

Node12 was deprecated recently. actions/checkout@v2 uses Node12 and actions/checkout@v3 uses Node16, so switch to that.