fix: added transform to issuerVersion (#3412)

Author: chesterkmr

services/workflows-service/src/collection-flow/dto/create-document.dto.ts

@@ -10,6 +10,9 @@ export class CreateDocumentDto {
   @IsString()
   type!: string;
 
+  @Transform(({ value }) => {
+    return value.toString();
+  })
   @IsString()
   issuingVersion!: string;