chore(deps): update dependencies and remove unused files

Updated several dependencies including:
- @aws-sdk/client-s3 from 3.965.0 to 3.975.0
- @aws-sdk/client-ses from 3.965.0 to 3.975.0
- @aws-sdk/client-sqs from 3.965.0 to 3.975.0
- dotenv from ^16.6.1 to ^16.5.0
- form-data from ^4.0.2 to ^4.0.5
- typescript from 5.9.3 to 5.8.3

Removed unused files:
- backend/.yarn/releases/yarn-4.9.1.cjs
- backend/package-lock.json

backend/src/support/heapdump/heapdump.service.ts

@@ -1,5 +1,6 @@
 import { Injectable } from '@nestjs/common';
 import { ConfigService } from '@nestjs/config';
+import { writeSnapshot } from 'heapdump';
 
 import { DateUtil } from '@/common';
 
@@ -15,12 +16,7 @@ export class HeapdumpService {
 
   public async writeSnapshot(code: string) {
     if (this._config?.accessCode && this._config.accessCode === code) {
-      try {
-        const { writeSnapshot } = await import('heapdump');
-        writeSnapshot(`heapdump-${DateUtil.now().toISOString()}.heapsnapshot`);
-      } catch (error) {
-        console.error('Heapdump not available:', error);
-      }
+      writeSnapshot(`heapdump-${DateUtil.now().toISOString()}.heapsnapshot`);
     }
   }
 }