deps: update codecov/codecov-action action to v4 (#148)

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This PR contains the following updates:

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

---

### Release Notes

<details>
<summary>codecov/codecov-action (codecov/codecov-action)</summary>

### [`v4`](https://togithub.com/codecov/codecov-action/compare/v3...v4)

[Compare
Source](https://togithub.com/codecov/codecov-action/compare/v3...v4)

</details>

---

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.github/workflows/test.yml

@@ -28,7 +28,9 @@ jobs:
 
       - run: make test
 
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   acceptance:
     strategy:
@@ -50,7 +52,9 @@ jobs:
 
       - run: make testacc
 
-      - uses: codecov/codecov-action@v3
+      - uses: codecov/codecov-action@v4
+        with:
+          token: ${{ secrets.CODECOV_TOKEN }}
 
   example:
     runs-on: ubuntu-latest