fix(linear): fix types (#148)

## Describe your changes

## Issue ticket number and link

## Checklist before requesting a review (skip if just adding/editing
APIs & templates)

-   [ ] I added tests, otherwise the reason is:
-   [ ] External API requests have `retries`
-   [ ] Pagination is used where appropriate
- [ ] The built in `nango.paginate` call is used instead of a `while
(true)` loop
- [ ] Third party requests are NOT parallelized (this can cause issues
with rate limits)
- [ ] If a sync requires metadata the `nango.yaml` has `auto_start:
false`
-   [ ] If the sync is a `full` sync then `track_deletes: true` is set
- [ ] I followed the best practices and guidelines from the [Writing
Integration
Scripts](/NangoHQ/integration-templates/blob/main/WRITING_INTEGRATION_SCRIPTS.md)
doc

flows.yaml

@@ -8875,7 +8875,8 @@ integrations:
                 id: string
                 assigneeId: string | null
                 creatorId: string | null
-                createdAt: date
+                createdAt: string
+                updatedAt: string
                 description: string | null
                 dueDate: date | null
                 projectId: string | null

integrations/linear/nango.yaml

@@ -42,7 +42,8 @@ models:
         id: string
         assigneeId: string | null
         creatorId: string | null
-        createdAt: date
+        createdAt: string
+        updatedAt: string
         description: string | null
         dueDate: date | null
         projectId: string | null

integrations/linear/syncs/issues.ts

@@ -63,7 +63,7 @@ export default async function fetchData(nango: NangoSync) {
             baseUrlOverride: 'https://api.linear.app',
             endpoint: '/graphql',
             data: {
-                query: query
+                query
             },
             retries: 10
         });
@@ -84,8 +84,8 @@ function mapIssues(records: any[]): LinearIssue[] {
             id: record.id,
             assigneeId: record.assignee?.id ? record.assignee.id : null,
             creatorId: record.creator?.id ? record.creator.id : null,
-            createdAt: new Date(record.createdAt),
-            updatedAt: new Date(record.updatedAt),
+            createdAt: new Date(record.createdAt).toISOString(),
+            updatedAt: new Date(record.updatedAt).toISOString(),
             description: record.description,
             dueDate: record.dueDate ? new Date(record.dueDate) : null,
             projectId: record.project?.id ? record.project.id : null,