downgrade pytest-cov to avoid conflict

requirements.txt

@@ -8,7 +8,7 @@ validate_email==1.3
 click-completion==0.5.2
 pbr==5.8.0
 notify-py==0.3.42
-pytest-cov==5.0.0
+pytest-cov==2.12.1
 Faker==25.2.0
 factory-boy==3.3.0
 pytest-mock==3.10.0