fix(service): return project version as int (#3591)

Author: olevski

renku/ui/service/serializers/version.py

@@ -21,7 +21,7 @@ class VersionResponse(Schema):
     """Version response schema."""
 
     latest_version = fields.String()
-    supported_project_version = fields.Number()
+    supported_project_version = fields.Integer()
     minimum_api_version = fields.String()
     maximum_api_version = fields.String()