chore: Update objectionjs version to 3

packages/backend/src/graphql/mutations/create-step.ts

@@ -1,6 +1,7 @@
 import { GraphQLNonNull } from 'graphql';
 import stepType, { stepInputType } from '../types/step';
 import RequestWithCurrentUser from '../../types/express/request-with-current-user';
+import StepEnumType from '../../types/step-enum-type';
 
 type Params = {
   input: {
@@ -41,7 +42,7 @@ const createStepResolver = async (
   const step = await flow.$relatedQuery('steps').insertAndFetch({
     key: input.key,
     appKey: input.appKey,
-    type: 'action',
+    type: StepEnumType.Action,
     position: previousStep.position + 1,
   });