test: lowercase false value for the FF_NEW_COOKIE_MANAGEMENT in dev

We had an error in the previous deployment so testing if lowercase value would fix the issue

Author: marianayovcheva

infrastructure/app/stages/dev.yaml

@@ -20,4 +20,4 @@ envVars:
   RAILS_ENV: production
   USE_TEST_SUPPLIERS: ${{ vars.USE_TEST_SUPPLIERS }}
   FF_SMALL_SUPPLIER_STARS: ${{ vars.FF_SMALL_SUPPLIER_STARS }}
-  FF_NEW_COOKIE_MANAGEMENT: "False"
+  FF_NEW_COOKIE_MANAGEMENT: "false"