Move zgw-consumers-oas to test requirements

Author: SonnyBA

setup.cfg

@@ -45,7 +45,6 @@ install_requires =
     isodate
     notifications-api-common>=0.3.0
     zgw-consumers>=0.35.1
-    zgw-consumers-oas
     oyaml
     PyJWT>=2.0.0
     requests
@@ -61,6 +60,7 @@ tests_require =
     black
     requests-mock
     freezegun
+    zgw-consumers-oas
 
 [options.packages.find]
 include =
@@ -80,6 +80,7 @@ tests =
     black
     requests-mock
     freezegun
+    zgw-consumers-oas
 pep8 = flake8
 coverage = pytest-cov
 docs =