BLOG-109 Fix published_time schema to include offset (#110)

### Description

Reference: https://zod.dev/api?id=iso-dates#iso-datetimes

- Add `{ offset: true }` as options.

### Package Changes

_No response_

### Screenshots

_No response_

### Reference

Resolves #109

### Checklist

- [x] A milestone is set
- [x] The related issuse has been linked to this branch

Reviewed-on: #110
Co-authored-by: SquidSpirit <squid@squidspirit.com>
Co-committed-by: SquidSpirit <squid@squidspirit.com>

frontend/src/lib/post/adapter/gateway/postInfoResponseDto.ts

@@ -8,7 +8,7 @@ export const PostInfoResponseSchema = z.object({
 	description: z.string(),
 	preview_image_url: z.url(),
 	labels: z.array(LabelResponseSchema),
-	published_time: z.iso.datetime()
+	published_time: z.iso.datetime({ offset: true })
 });
 
 export class PostInfoResponseDto {