Update Python dependencies

Author: mdmintz

requirements.txt

@@ -1,7 +1,7 @@
 pip>=20.2.2
 packaging>=20.4
 setuptools>=44.1.1;python_version<"3.5"
-setuptools>=50.1.0;python_version>="3.5"
+setuptools>=50.2.0;python_version>="3.5"
 setuptools-scm>=4.1.2
 wheel>=0.35.1
 six==1.15.0
@@ -17,6 +17,7 @@ selenium==3.141.0
 msedge-selenium-tools==3.141.2
 more-itertools==5.0.0;python_version<"3.5"
 more-itertools==8.5.0;python_version>="3.5"
+cssselect==1.1.0
 pluggy==0.13.1
 attrs>=20.1.0
 py==1.8.1;python_version<"3.5"
@@ -44,7 +45,7 @@ pyopenssl==19.1.0
 pygments==2.5.2;python_version<"3.5"
 pygments==2.6.1;python_version>="3.5"
 traitlets==4.3.3;python_version<"3.7"
-traitlets==5.0.2;python_version>="3.7"
+traitlets==5.0.3;python_version>="3.7"
 prompt-toolkit==1.0.18;python_version<"3.6"
 prompt-toolkit==3.0.7;python_version>="3.6"
 ipython==5.10.0;python_version<"3.5"

setup.py

@@ -93,7 +93,7 @@
         'pip>=20.2.2',
         'packaging>=20.4',
         'setuptools>=44.1.1;python_version<"3.5"',
-        'setuptools>=50.1.0;python_version>="3.5"',
+        'setuptools>=50.2.0;python_version>="3.5"',
         'setuptools-scm',
         'wheel>=0.35.1',
         'six',
@@ -109,6 +109,7 @@
         'msedge-selenium-tools==3.141.2',
         'more-itertools==5.0.0;python_version<"3.5"',
         'more-itertools==8.5.0;python_version>="3.5"',
+        'cssselect==1.1.0',
         'pluggy==0.13.1',
         'attrs>=20.1.0',
         'py==1.8.1;python_version<"3.5"',
@@ -136,7 +137,7 @@
         'pygments==2.5.2;python_version<"3.5"',
         'pygments==2.6.1;python_version>="3.5"',
         'traitlets==4.3.3;python_version<"3.7"',
-        'traitlets==5.0.2;python_version>="3.7"',
+        'traitlets==5.0.3;python_version>="3.7"',
         'ipython==5.10.0;python_version<"3.5"',
         'prompt-toolkit==1.0.18;python_version<"3.6"',
         'prompt-toolkit==3.0.7;python_version>="3.6"',