Add pyproject.toml to lockfile sources

Author: maresb

.github/workflows/update-lockfile.yml

@@ -32,6 +32,7 @@ jobs:
         conda-lock lock --mamba \
         --extras test \
         --filter-extras \
+        --file pyproject.toml \
         --file conda/environment-test-${{ matrix.python-version }}.yaml \
         --lockfile conda/conda-lock-${{ matrix.python-version }}.yaml