ci: fix code coverage (#238)

Author: g105b

.github/workflows/ci.yml

@@ -94,9 +94,10 @@ jobs:
         run: cat "_coverage/coverage.txt"
 
       - name: Upload to Codecov
-        uses: codecov/codecov-action@v6
+        uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
+          slug: ${{ github.repository }}
 
   phpstan:
     runs-on: ubuntu-latest