Drop plotly and ploty-express dependencies

Change-Id: I80d2136ba02bdaab667465dd848439bafe8961c2
diff --git a/setup.py b/setup.py
index 2b0ba0d..9fc5a97 100644
--- a/setup.py
+++ b/setup.py
@@ -31,8 +31,6 @@
     python_requires='>=3.7',
     install_requires=[
         'rpy2>=3.3',
-        'plotly',
-        'plotly-express',
         'pandas>=1.2',
         'packaging',
         'markdown'