fix: pin pytest version <6.1.0 to avoid pytest-rerunfailures breaking changes (aws#1927)

Co-authored-by: Chuyang Deng <[email protected]>

Author: 2 people

setup.py

@@ -61,7 +61,7 @@ def read_version():
         extras["all"],
         "tox",
         "flake8",
-        "pytest",
+        "pytest<6.1.0",
         "pytest-cov",
         "pytest-rerunfailures",
         "pytest-xdist",