⬆️ Bump codecov/codecov-action action to v6 (#128)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[codecov/codecov-action](https://redirect.github.com/codecov/codecov-action)
| action | major | `v5` → `v6` |

---

### Release Notes

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

###
[`v6`](https://redirect.github.com/codecov/codecov-action/compare/v5...v6)

[Compare
Source](https://redirect.github.com/codecov/codecov-action/compare/v5...v6)

</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 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

---

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.github/workflows/build.yml

@@ -19,7 +19,7 @@ jobs:
         run: |
           hatch test --all
 
-      - uses: codecov/codecov-action@75cd11691c0faa626561e295848008c8a7dddffe # v5
+      - uses: codecov/codecov-action@57e3a136b779b570ffcdbf80b3bdc90e7fab3de2 # v6
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           fail_ci_if_error: false