Add step to set up PySR's julia dependencies

.github/workflows/CI_conda_forge.yml

@@ -34,6 +34,8 @@ jobs:
           activate-environment: test
       - name: "Install pysr-forge"
         run: conda activate test && mamba install pysr
+      - name: "Set up PySR's Julia dependencies"
+        run: conda activate test && python3 -c 'import pysr; pysr.install()'
       - name: "Ensure that static libpython warning appears"
         run: conda activate test && python3 -m unittest test.test_static_libpython_warning
       - name: "Run tests"