chore: pip check on conda forge dependencies

noxfile.py

@@ -22,6 +22,7 @@
 import re
 import shutil
 import warnings
+import subprocess
 
 import nox
 
@@ -598,6 +599,10 @@ def conda_test(session):
     # for troubleshooting purposes.
     session.run("mamba", "list")
 
+    subprocess.run(
+        ["pip", "check"], check=True
+    )  # Raise an exception if pip check fails
+
     # Tests are limited to unit tests only, at this time.
     session.run(
         "py.test",