Update pytest-xdist version to 1.28.0

Author: mdmintz

requirements.txt

@@ -13,7 +13,7 @@ pytest-cov>=2.6.1
 pytest-html>=1.20.0
 pytest-metadata>=1.8.0
 pytest-rerunfailures>=7.0
-pytest-xdist>=1.27.0
+pytest-xdist>=1.28.0
 parameterized>=0.7.0
 beautifulsoup4>=4.6.0
 colorama==0.4.1

setup.py

@@ -66,7 +66,7 @@
         'pytest-html>=1.20.0',
         'pytest-metadata>=1.8.0',
         'pytest-rerunfailures>=7.0',
-        'pytest-xdist>=1.27.0',
+        'pytest-xdist>=1.28.0',
         'parameterized>=0.7.0',
         'beautifulsoup4>=4.6.0',  # Keep at >=4.6.0 while using bs4
         'colorama==0.4.1',