CI updates (#202)

* update deprecated codecov arg

* leverage channels from environment file rather than workflow arg

Author: kafitzgerald

.github/workflows/ci.yaml

@@ -38,9 +38,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: conda-incubator/setup-miniconda@v3
         with:
-          channels: conda-forge
           activate-environment: pythia-datasets
-          auto-update-conda: false
           python-version: ${{ matrix.python-version }}
           environment-file: ci/environment.yml
 
@@ -56,7 +54,7 @@ jobs:
       - name: Upload code coverage to Codecov
         uses: codecov/[email protected]
         with:
-          file: ./coverage.xml
+          files: ./coverage.xml
           flags: unittests
           env_vars: OS,PYTHON
           name: codecov-umbrella