chore(deps): update actions/upload-artifact action to v7 (#266)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[actions/upload-artifact](https://redirect.github.com/actions/upload-artifact)
| action | major | `v6` → `v7` |

---

### Release Notes

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

###
[`v7`](https://redirect.github.com/actions/upload-artifact/compare/v6...v7)

[Compare
Source](https://redirect.github.com/actions/upload-artifact/compare/v6...v7)

</details>

---

### Configuration

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

🚦 **Automerge**: Enabled.

♻ **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

---

This PR was generated by [Mend Renovate](https://mend.io/renovate/).
View the [repository job
log](https://developer.mend.io/github/goodtune/vitriolic).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiI0My4zNi4yIiwidXBkYXRlZEluVmVyIjoiNDMuMzYuMiIsInRhcmdldEJyYW5jaCI6Im1haW4iLCJsYWJlbHMiOltdfQ==-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/e2e-tests.yml

@@ -24,7 +24,7 @@ jobs:
         uvx tox -e e2e
 
     - name: Upload test results
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       if: always()
       with:
         name: e2e-test-results
@@ -34,7 +34,7 @@ jobs:
         retention-days: 5
 
     - name: Upload test screenshots
-      uses: actions/upload-artifact@v6
+      uses: actions/upload-artifact@v7
       if: always()
       with:
         name: e2e-test-screenshots