Update Python dependencies (setuptools, traitlets, ipython)

Author: mdmintz

requirements.txt

@@ -1,7 +1,7 @@
 pip>=20.2.2
 packaging>=20.4
 setuptools>=44.1.1;python_version<"3.5"
-setuptools>=49.6.0;python_version>="3.5"
+setuptools>=50.0.0;python_version>="3.5"
 setuptools-scm>=4.1.2
 wheel>=0.35.1
 six==1.15.0
@@ -45,8 +45,11 @@ prompt-toolkit==1.0.18;python_version<"3.6.1"
 prompt-toolkit==3.0.7;python_version>="3.6.1"
 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==5.0.0;python_version>="3.7"
 ipython==5.10.0;python_version<"3.5"
-ipython==6.5.0;python_version>="3.5" and python_version<"3.7"
+ipython==6.5.0;python_version>="3.5" and python_version<"3.6"
+ipython==7.16.1;python_version>="3.6" and python_version<"3.7"
 ipython==7.18.1;python_version>="3.7"
 colorama==0.4.3
 pymysql==0.10.0

setup.py

@@ -93,7 +93,7 @@
         'pip>=20.2.2',
         'packaging>=20.4',
         'setuptools>=44.1.1;python_version<"3.5"',
-        'setuptools>=49.6.0;python_version>="3.5"',
+        'setuptools>=50.0.0;python_version>="3.5"',
         'setuptools-scm',
         'wheel>=0.35.1',
         'six',
@@ -137,8 +137,11 @@
         'prompt-toolkit==3.0.7;python_version>="3.6.1"',
         '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==5.0.0;python_version>="3.7"',
         'ipython==5.10.0;python_version<"3.5"',
-        'ipython==6.5.0;python_version>="3.5" and python_version<"3.7"',
+        'ipython==6.5.0;python_version>="3.5" and python_version<"3.6"',
+        'ipython==7.16.1;python_version>="3.6" and python_version<"3.7"',
         'ipython==7.18.1;python_version>="3.7"',
         'colorama==0.4.3',
         'pymysql==0.10.0',