Update Python dependencies

Author: mdmintz

requirements.txt

@@ -2,7 +2,7 @@ pip>=20.3.3
 packaging>=20.8
 setuptools>=44.1.1;python_version<"3.5"
 setuptools>=50.3.2;python_version>="3.5" and python_version<"3.6"
-setuptools>=51.1.2;python_version>="3.6"
+setuptools>=51.3.3;python_version>="3.6"
 setuptools-scm>=5.0.1
 wheel>=0.36.2
 attrs>=20.3.0
@@ -30,7 +30,7 @@ py==1.10.0;python_version>="3.5"
 pytest==4.6.11;python_version<"3.5"
 pytest==6.1.2;python_version>="3.5" and python_version<"3.6"
 pytest==6.2.1;python_version>="3.6"
-pytest-cov==2.10.1
+pytest-cov==2.11.0
 pytest-forked==1.3.0
 pytest-html==1.22.1;python_version<"3.6"
 pytest-html==2.0.1;python_version>="3.6"
@@ -64,7 +64,7 @@ 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"
-virtualenv>=20.3.1
+virtualenv>=20.4.0
 pymysql==0.10.1;python_version<"3.6"
 pymysql==1.0.2;python_version>="3.6"
 coverage==5.3.1

setup.py

@@ -106,7 +106,7 @@
         'packaging>=20.8',
         'setuptools>=44.1.1;python_version<"3.5"',
         'setuptools>=50.3.2;python_version>="3.5" and python_version<"3.6"',
-        'setuptools>=51.1.2;python_version>="3.6"',
+        'setuptools>=51.3.3;python_version>="3.6"',
         'setuptools-scm>=5.0.1',
         'wheel>=0.36.2',
         'attrs>=20.3.0',
@@ -134,7 +134,7 @@
         'pytest==4.6.11;python_version<"3.5"',
         'pytest==6.1.2;python_version>="3.5" and python_version<"3.6"',
         'pytest==6.2.1;python_version>="3.6"',
-        'pytest-cov==2.10.1',
+        'pytest-cov==2.11.0',
         'pytest-forked==1.3.0',
         'pytest-html==1.22.1;python_version<"3.6"',
         'pytest-html==2.0.1;python_version>="3.6"',
@@ -168,7 +168,7 @@
         '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"
-        'virtualenv>=20.3.1',  # Sync with importlib-metadata and pathlib2
+        'virtualenv>=20.4.0',  # Sync with importlib-metadata and pathlib2
         'pymysql==0.10.1;python_version<"3.6"',
         'pymysql==1.0.2;python_version>="3.6"',
         'coverage==5.3.1',