chore(deps): update actions/download-artifact action to v4 (#74)

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This PR contains the following updates:

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

---

### Release Notes

<details>
<summary>actions/download-artifact (actions/download-artifact)</summary>

###
[`v4`](https://togithub.com/actions/download-artifact/compare/v3...v4)

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

</details>

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---

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.github/workflows/build.yml

@@ -167,17 +167,17 @@ jobs:
         with:
           fetch-depth: 0
       - name: Download code coverage files (MacOS)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: Code coverage (MacOS)
           path: Coverage/MacOS
       - name: Download code coverage files (Ubuntu)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: Code coverage (Ubuntu)
           path: Coverage/Ubuntu
       - name: Download code coverage files (Windows)
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4
         with:
           name: Code coverage (Windows)
           path: Coverage/Windows