Fix version check integration test (#2492)

* Only run the version check on non cog-runtime
builds

Author: 8W9aG

test-integration/test_integration/fixtures/string-project/cog.yaml

@@ -1,3 +1,4 @@
 build:
   python_version: "3.8"
+  cog_runtime: false
 predict: "predict.py:Predictor"