Update actions/checkout action to v5 (#111)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [actions/checkout](https://redirect.github.com/actions/checkout) | action | major | `v4` -> `v5` |

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### Release Notes

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

### [`v5`](https://redirect.github.com/actions/checkout/compare/v4...v5)

[Compare Source](https://redirect.github.com/actions/checkout/compare/v4...v5)

</details>

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### Configuration

📅 **Schedule**: Branch creation - "every weekday after 9am before 5pm" in timezone America/New_York, 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.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [Renovate Bot](https://redirect.github.com/renovatebot/renovate).
<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0MS42Mi4xIiwidXBkYXRlZEluVmVyIjoiNDEuNjIuMSIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOlsiYXV0b21lcmdlIl19-->

Author: renovate-thm[bot]

.github/workflows/automation-autosquash.yml

@@ -27,7 +27,7 @@ jobs:
           app-id: ${{ secrets.THM_AUTOMATION_APP_ID }}
           private-key: ${{ secrets.THM_AUTOMATION_PRIVATE_KEY }}
       - if: github.event.pull_request.head.repo.full_name == 'theoremlp/rules_mypy'
-        uses: actions/checkout@v4
+        uses: actions/checkout@v5
       - if: github.event.pull_request.head.repo.full_name == 'theoremlp/rules_mypy'
         uses: theoremlp/autosquash@v1
         with:

.github/workflows/automation-update-requirements.yml

@@ -18,7 +18,7 @@ jobs:
         with:
           app-id: ${{ secrets.THM_AUTOMATION_APP_ID }}
           private-key: ${{ secrets.THM_AUTOMATION_PRIVATE_KEY }}
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
         with:
           token: ${{ steps.app-token.outputs.token }}
           ref: ${{ github.event.pull_request.head.sha }}

.github/workflows/ci.yml

@@ -17,7 +17,7 @@ jobs:
         os: ["ubuntu-latest"]
     runs-on: ${{ matrix.os }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
       - uses: bazel-contrib/[email protected]
         with:
           repository-cache: true