⬆️ Update actions/upload-artifact action to v4 (#114)

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

Author: renovate[bot]

.github/workflows/tests.yaml

@@ -26,7 +26,7 @@ jobs:
       - name: Test
         run: go test -v ./... -race -coverprofile=coverage.out -covermode=atomic
       - name: ⬆️ Upload coverage artifact
-        uses: actions/upload-artifact@v3.1.3
+        uses: actions/upload-artifact@v4.3.0
         with:
           name: coverage-${{ matrix.go }}
           path: coverage.out