Fix bad PropTypes reference

src/core/plugins/oas3/components/callbacks.jsx

@@ -41,7 +41,7 @@ const Callbacks = (props) => {
 }
 
 Callbacks.propTypes = {
-  getComponent: PropTypes.function.isRequired,
+  getComponent: PropTypes.func.isRequired,
   callbacks: PropTypes.array.isRequired
 
 }

src/core/plugins/oas3/components/request-body.jsx

@@ -34,7 +34,7 @@ const RequestBody = ({ requestBody, getComponent, specSelectors, contentType })
 
 RequestBody.propTypes = {
   requestBody: ImPropTypes.orderedMap.isRequired,
-  getComponent: PropTypes.function.isRequired,
+  getComponent: PropTypes.func.isRequired,
   specSelectors: PropTypes.object.isRequired,
   contentType: PropTypes.string.isRequired
 }