Bump actions/checkout from v2.3.2 to v2.3.3 (#16)

Bumps [actions/checkout](https://github.com/actions/checkout) from v2.3.2 to v2.3.3.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v2.3.2...a81bbbf8298c0fa03ea29cdc473d45769f953675)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
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