Remove importlib-metadata (Python versions >= 3.6)

Author: mdmintz

requirements.txt

@@ -56,7 +56,6 @@ ipython==7.19.0;python_version>="3.7"
 colorama==0.4.4
 pathlib2==2.3.5;python_version<"3.5"
 importlib-metadata==2.0.0;python_version<"3.6"
-importlib-metadata==3.1.0;python_version>="3.6"
 virtualenv>=20.2.1
 pymysql==0.10.1
 coverage==5.3

setup.py

@@ -160,7 +160,6 @@
         'colorama==0.4.4',
         'pathlib2==2.3.5;python_version<"3.5"',  # Sync with "virtualenv"
         'importlib-metadata==2.0.0;python_version<"3.6"',  # Sync "virtualenv"
-        'importlib-metadata==3.1.0;python_version>="3.6"',  # Sync "virtualenv"
         'virtualenv>=20.2.1',  # Sync with importlib-metadata and pathlib2
         'pymysql==0.10.1',
         'coverage==5.3',