Update actions/checkout action to v4 (#9)

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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` |

---

### 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>

---

### Configuration

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are satisfied.

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rebase/retry checkbox.

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---

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---

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.github/workflows/deploy.yml

@@ -11,7 +11,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: checkout source
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: Run chktex
               uses: xu-cheng/texlive-action/full@v1
@@ -26,7 +26,7 @@ jobs:
       runs-on: ubuntu-latest
       steps:
         - name: checkout source
-          uses: actions/checkout@v3
+          uses: actions/checkout@v4
 
         - name: set up python
           uses: actions/setup-python@v4
@@ -63,7 +63,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: checkout source
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: Run Vale
               uses: errata-ai/vale-action@v2
@@ -78,7 +78,7 @@ jobs:
         runs-on: ubuntu-latest
         steps:
             - name: checkout source
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: Build PDF
               uses: xu-cheng/texlive-action/full@v1
@@ -99,7 +99,7 @@ jobs:
         needs: compile-latex
         steps:
             - name: checkout source
-              uses: actions/checkout@v3
+              uses: actions/checkout@v4
 
             - name: Download artefacts
               uses: actions/download-artifact@v3

.github/workflows/license.yml

@@ -8,7 +8,7 @@ jobs:
   update-license-year:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: FantasticFiasco/action-update-license-year@v3