⬆️ Update 👷 GitHub Action codecov/codecov-action to v4 (#74)

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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 | `v3.1.6` -> `v4.0.0` |

---

### Release Notes

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

###
[`v4.0.0`](https://togithub.com/codecov/codecov-action/compare/v3.1.6...v4.0.0)

[Compare
Source](https://togithub.com/codecov/codecov-action/compare/v3.1.6...v4.0.0)

</details>

---

### Configuration

📅 **Schedule**: Branch creation - At any time (no schedule defined),
Automerge - At any time (no schedule defined).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR is behind base branch, 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

---

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.github/workflows/test.yml

@@ -27,7 +27,7 @@ jobs:
           -cover ${{github.workspace}}
           2>&1 | gotestfmt
       - name: Upload Code Coverage
-        uses: codecov/codecov-action@ab904c41d6ece82784817410c45d8b8c02684457 # v3.1.6
+        uses: codecov/codecov-action@f30e4959ba63075080d4f7f90cacc18d9f3fafd7 # v4.0.0
         with:
           fail_ci_if_error: true
           directory: ${{github.workspace}}