Upgrade pytest-django to 3.6 in the test environment

Signed-off-by: Nabarun Pal <[email protected]>

Author: palnabarun

tools/requirements-test.txt

@@ -1,6 +1,6 @@
 factory-boy==2.11.1
 
-pytest-django==3.4.8
+pytest-django==3.6
 pytest-cov==2.6.1
 
 coverage==5.0.4