updates required sphinx rtd theme

for sphinx 7 incompatibility issue

Author: billbrod

docs/environment.yml

@@ -5,7 +5,8 @@ channels:
 
 dependencies:
   - sphinx
-  - sphinx_rtd_theme
+  # fix sphinx 7 incompatibility issue
+  - 'sphinx_rtd_theme>=1.3.0rc1'
   - numpydoc
   - numpy
   - python