Renovate: actions/checkout to v4 (#10)

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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://togithub.com/actions/checkout) | action |
major | `v3` -> `v4` |
| [actions/checkout](https://togithub.com/actions/checkout) | action |
major | `v2` -> `v4` |

---

### Release Notes

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

###
[`v4`](https://togithub.com/actions/checkout/blob/HEAD/CHANGELOG.md#v400)

[Compare Source](https://togithub.com/actions/checkout/compare/v3...v4)

- [Support fetching without the --progress
option](https://togithub.com/actions/checkout/pull/1067)
-   [Update to node20](https://togithub.com/actions/checkout/pull/1436)

</details>

---

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any time (no schedule defined).

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rebase/retry checkbox.

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---

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---

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[here](https://developer.mend.io/github/UCL-MIRSG/ansible-role-install-python).

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.github/workflows/checks.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: checkout source
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: set up python
         uses: actions/setup-python@v4

.github/workflows/molecule.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out the codebase
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: "mirsg.install_python"
       - name: Set up Python 3
@@ -48,7 +48,7 @@ jobs:
             molecule_docker_command: /lib/systemd/systemd
     steps:
       - name: Check out the codebase
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           path: "mirsg.install_python"
       - name: Set up Python 3.9