ci(deps): update actions/checkout action to v2.7.0 (#53)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://togithub.com/actions/checkout) | action |
minor | `v2.4.1` -> `v2.7.0` |

---

### Release Notes

<details>
<summary>actions/checkout (actions/checkout)</summary>

###
[`v2.7.0`](https://togithub.com/actions/checkout/releases/tag/v2.7.0)

[Compare
Source](https://togithub.com/actions/checkout/compare/v2.6.0...v2.7.0)

##### What's Changed

- Add new public key for known_hosts
([#&#8203;1237](https://togithub.com/actions/checkout/issues/1237)) by
[@&#8203;TingluoHuang](https://togithub.com/TingluoHuang) in
[https://github.com/actions/checkout/pull/1238](https://togithub.com/actions/checkout/pull/1238)

**Full Changelog**:
actions/checkout@v2.6.0...v2.7.0

###
[`v2.6.0`](https://togithub.com/actions/checkout/releases/tag/v2.6.0)

[Compare
Source](https://togithub.com/actions/checkout/compare/v2.5.0...v2.6.0)

#### What's Changed

- Add backports to v2 branch by
[@&#8203;cory-miller](https://togithub.com/cory-miller) in
[https://github.com/actions/checkout/pull/1040](https://togithub.com/actions/checkout/pull/1040)
- Includes backports from the following changes:
[https://github.com/actions/checkout/pull/964](https://togithub.com/actions/checkout/pull/964),
[https://github.com/actions/checkout/pull/1002](https://togithub.com/actions/checkout/pull/1002),
[https://github.com/actions/checkout/pull/1029](https://togithub.com/actions/checkout/pull/1029)
    -   Upgraded the licensed version to match what is used in v3.

**Full Changelog**:
actions/checkout@v2.5.0...v2.6.0

###
[`v2.5.0`](https://togithub.com/actions/checkout/releases/tag/v2.5.0)

[Compare
Source](https://togithub.com/actions/checkout/compare/v2.4.2...v2.5.0)

##### What's Changed

- Update [@&#8203;actions/core](https://togithub.com/actions/core) to
1.10.0 by [@&#8203;rentziass](https://togithub.com/rentziass) in
[https://github.com/actions/checkout/pull/962](https://togithub.com/actions/checkout/pull/962)

**Full Changelog**:
actions/checkout@v2...v2.5.0

###
[`v2.4.2`](https://togithub.com/actions/checkout/releases/tag/v2.4.2)

[Compare
Source](https://togithub.com/actions/checkout/compare/v2.4.1...v2.4.2)

##### What's Changed

- Add set-safe-directory input to allow customers to take control.
([#&#8203;770](https://togithub.com/actions/checkout/issues/770)) by
[@&#8203;TingluoHuang](https://togithub.com/TingluoHuang) in
[https://github.com/actions/checkout/pull/776](https://togithub.com/actions/checkout/pull/776)
- Prepare changelog for v2.4.2. by
[@&#8203;TingluoHuang](https://togithub.com/TingluoHuang) in
[https://github.com/actions/checkout/pull/778](https://togithub.com/actions/checkout/pull/778)

**Full Changelog**:
actions/checkout@v2...v2.4.2

</details>

---

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---

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---

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.github/workflows/default_linter_callable.yml

@@ -105,7 +105,7 @@ jobs:
     needs: find-changes-for-shell-output
     if: needs.find-changes-for-shell-output.outputs.yaml == 'true'
     steps:
-      - uses: actions/checkout@f25a3a9f25bd5f4c5d77189cab02ff357b5aedeb # v2.4.1
+      - uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
 
       - name: yaml-lint
         uses: ibiqlik/action-yamllint@2576378a8e339169678f9939646ee3ee325e845c # v3.1.1