[doc] install myst-parser in workflow

Author: nkavokine

.github/workflows/build.yml

@@ -56,8 +56,8 @@ jobs:
         python3-numpy
         python3-pip
         python3-scipy
-        python3-sphinx
-        python3-nbsphinx
+        pip3 install myst-parser linkify-it-py &&
+        pip3 install sphinx==5.3.0 sphinx-rtd-theme
 
     - name: Install homebrew dependencies
       if: matrix.os == 'macos-12'