[requires.io] dependency update

Author: requires

tox.ini

@@ -32,7 +32,7 @@ commands =
 basepython = python3.8
 deps =
     black==20.8b1
-    isort==5.4.2
+    isort==5.6.4
 commands =
     black --check --diff src/ test/ example/ compliance/ bench/
     isort --check --diff src/ test/ example/ compliance/ bench/
@@ -48,13 +48,13 @@ commands =
 [testenv:lint]
 basepython = python3.8
 deps =
-    prospector==1.3.0
+    prospector==1.3.1
 commands = prospector
 
 [testenv:docs]
 basepython = python3.8
 deps =
-    sphinx==3.2.1
+    sphinx==3.3.1
 whitelist_externals = make
 changedir = {toxinidir}/docs
 commands =
@@ -64,8 +64,8 @@ commands =
 [testenv:packaging]
 basepython = python3.8
 deps =
-    check-manifest==0.42
-    readme-renderer==26.0
+    check-manifest==0.45
+    readme-renderer==28.0
     twine==3.2.0
 whitelist_externals = rm
 commands =