Scheduled weekly dependency update for week 29 (#124)

* Update black from 21.6b0 to 21.7b0

* Update bleach from 3.3.0 to 3.3.1

* Update requests from 2.25.1 to 2.26.0

* Update tox from 3.23.1 to 3.24.0

* Update virtualenv from 20.4.7 to 20.6.0

requirements.txt

@@ -2,8 +2,8 @@ asttokens==2.0.5
 appdirs==1.4.4
 atomicwrites==1.4.0
 attrs==21.2.0
-black==21.6b0
-bleach==3.3.0
+black==21.7b0
+bleach==3.3.1
 bumpversion==0.6.0
 certifi==2021.5.30
 chardet==4.0.0
@@ -26,13 +26,13 @@ Pygments==2.9.0
 pytest==6.2.4
 pytest-cov==2.12.1
 readme-renderer==29.0
-requests==2.25.1
+requests==2.26.0
 requests-toolbelt==0.9.1
 six==1.16.0
 toml==0.10.2
-tox==3.23.1
+tox==3.24.0
 tqdm==4.61.2
 twine==3.4.1
 urllib3==1.26.6
-virtualenv==20.4.7
+virtualenv==20.6.0
 webencodings==0.5.1