Update pytest for testing extra (#1365)

Author: rbpatt2019

requires-testing.txt

@@ -1,4 +1,4 @@
-pytest==5.3.5;python_version>="3.0"
+pytest==6.0.1;python_version>="3.0"
 pytest==4.6.9;python_version=="2.7"
 pytest-sugar==0.9.2
 pytest-mock==2.0.0
@@ -7,4 +7,4 @@ selenium==3.141.0
 percy==2.0.2
 requests[security]==2.21.0
 beautifulsoup4==4.8.2
-waitress==1.4.3
+waitress==1.4.3