chore(deps): update actions/checkout action to v4

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	v3 -> v4

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Release Notes

actions/checkout (actions/checkout)

### [`v4`](https://togithub.com/actions/checkout/blob/HEAD/CHANGELOG.md#v417) [Compare Source](https://togithub.com/actions/checkout/compare/v3...v4) - Bump the minor-npm-dependencies group across 1 directory with 4 updates by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/actions/checkout/pull/1739](https://togithub.com/actions/checkout/pull/1739) - Bump actions/checkout from 3 to 4 by [@​dependabot](https://togithub.com/dependabot) in [https://github.com/actions/checkout/pull/1697](https://togithub.com/actions/checkout/pull/1697) - Check out other refs/\* by commit by [@​orhantoy](https://togithub.com/orhantoy) in [https://github.com/actions/checkout/pull/1774](https://togithub.com/actions/checkout/pull/1774) - Pin actions/checkout's own workflows to a known, good, stable version. by [@​jww3](https://togithub.com/jww3) in [https://github.com/actions/checkout/pull/1776](https://togithub.com/actions/checkout/pull/1776)

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 77.55%. Comparing base (b3f9d65) to head (3051719).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #849 +/- ## ========================================= Coverage 77.55% 77.55% Complexity 966 966 ========================================= Files 97 97 Lines 4531 4531 Branches 422 422 ========================================= Hits 3514 3514 Misses 835 835 Partials 182 182 ```

:umbrella: View full report in Codecov by Sentry.
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[dbwiddis]

Closing as v3 is required for the security docker image

[mend-for-github-com[bot]]

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