bump dev dependencies

Author: Kriechi

tox.ini

@@ -12,9 +12,9 @@ python =
 passenv =
     GITHUB_*
 deps =
-    pytest==5.4.3
-    pytest-cov==2.10.0
-    pytest-xdist==1.33.0
+    pytest==6.0.1
+    pytest-cov==2.10.1
+    pytest-xdist==2.0.0
     hypothesis>=5.5,<6
     attrs==19.3.0
 commands =
@@ -33,7 +33,7 @@ commands = flake8 --max-complexity 10 src test utils
 [testenv:docs]
 basepython = python3.8
 deps =
-    sphinx==3.1.2
+    sphinx==3.2.1
 changedir = {toxinidir}/docs
 whitelist_externals = rm
 commands =
@@ -43,8 +43,8 @@ commands =
 [testenv:packaging]
 basepython = python3.8
 deps =
-    check-manifest==0.41
-    readme-renderer==25.0
+    check-manifest==0.42
+    readme-renderer==26.0
     twine==3.2.0
 commands =
     check-manifest
@@ -54,7 +54,7 @@ commands =
 [testenv:bench]
 deps =
     {[testenv]deps}
-    pytest-benchmark==3.1.1
+    pytest-benchmark==3.2.3
 commands =
     pytest {toxinidir}/bench/ --benchmark-only --benchmark-group-by=name --benchmark-autosave --benchmark-compare --benchmark-min-rounds=500000