Update ci.yml

Try removing slug, now error states in codecov upload process "repository not found"

Author: clauspruefer

.github/workflows/ci.yml

@@ -32,4 +32,3 @@ jobs:
         uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_MICRO_ESB }}
-          slug: clauspruefer/python-xml-microparser