ci: tokenless coverage

Author: g105b

.github/workflows/ci.yml

@@ -76,9 +76,9 @@ jobs:
         run: cat "_coverage/coverage.txt"
 
       - name: Upload to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
-          token: ${{ secrets.CODECOV_TOKEN }}
+          slug: phpgt/CssXPath
 
   phpstan:
     runs-on: ubuntu-latest