Update actions/checkout action to v3.1.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	minor	v3.0.2 -> v3.1.0

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⚠ Dependency Lookup Warnings ⚠

Warnings were logged while processing this repo. Please check the logs for more information.

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Release Notes

actions/checkout

### [`v3.1.0`](https://togithub.com/actions/checkout/blob/HEAD/CHANGELOG.md#v310) [Compare Source](https://togithub.com/actions/checkout/compare/v3.0.2...v3.1.0) - [Use @​actions/core `saveState` and `getState`](https://togithub.com/actions/checkout/pull/939) - [Add `github-server-url` input](https://togithub.com/actions/checkout/pull/922)

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Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

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• [ ] If you want to rebase/retry this PR, click this checkbox.

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[github-actions[bot]]

Test Results

12 files  ±0  12 suites  ±0   23s :stopwatch: ±0s 10 tests ±0  10 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0  20 runs  ±0  20 :heavy_check_mark: ±0  0 :zzz: ±0  0 :x: ±0 

Results for commit db661e56. ± Comparison against base commit a3e710bf.