Update pytest from 6.1.2 to 6.2.1

requirements.txt

@@ -7,7 +7,7 @@ scikit-image==0.18.1
 python-dateutil==2.8.1
 wget==3.2
 joblib==1.0.0
-pytest==6.1.2
+pytest==6.2.1
 pytest-cov==2.10.1
 jsonschema==3.2.0
 tqdm==4.54.0