update requirements

requirements.txt

@@ -4,14 +4,14 @@ backports.entry-points-selectable==1.1.0
 bento-lib==3.0.1
 certifi==2021.5.30
 chardet==4.0.0
-charset-normalizer==2.0.3
-codecov==2.1.11
+charset-normalizer==2.0.4
+codecov==2.1.12
 coverage==5.5
 distlib==0.3.2
 filelock==3.0.12
 flake8==3.9.2
 idna==2.10
-importlib-metadata==4.6.1
+importlib-metadata==4.6.3
 jsonschema==3.2.0
 mccabe==0.6.1
 more-itertools==8.8.0
@@ -29,8 +29,8 @@ requests==2.26.0
 six==1.16.0
 toml==0.10.2
 tornado==6.1
-tox==3.24.0
+tox==3.24.1
 urllib3==1.26.6
-virtualenv==20.6.0
+virtualenv==20.7.0
 Werkzeug==2.0.1
 zipp==3.5.0