[ci] try coverage builtin lcov support

.github/workflows/testing.yml

@@ -40,7 +40,7 @@ jobs:
         run: ln -sf /usr/lib/x86_64-linux-gnu/libstdc++.so.6 /usr/share/miniconda/envs/test/lib/libstdc++.so.6
       - name: Install testing dependencies
         run: |
-          conda install -c conda-forge --file requirements-conda.txt --file requirements-linting-old.txt six packaging pytest coveralls coverage libstdcxx-ng toml coverage_lcov
+          conda install -c conda-forge --file requirements-conda.txt --file requirements-linting-old.txt six packaging pytest coveralls coverage libstdcxx-ng toml
       - name: Conda info
         run: |
           conda info
@@ -55,7 +55,7 @@ jobs:
       - run: coverage run -m pytest .
       - name: Convert coverage output to lcov for coveralls
         run: |
-          coverage-lcov
+          coverage lcov
           # make paths relative
           sed -i s,$PWD/,,g lcov.info
       - name: prepare coveralls partial upload