[Bug][milvus] SeaTunnel-9677 resolve Expected a com.google.gson.JsonObject but was com.google.gson.JsonPrimitive

[sohurdc]

Purpose of this pull request

This pull request resolve SeaTunnel-9677 issue: #9677

Does this PR introduce any user-facing change?

No

How was this patch tested?

milvus with column type is json

Check list

• If any new Jar binary package adding in your PR, please add License Notice according
  New License Guide
• If necessary, please update the documentation to describe the new feature. https://github.com/apache/seatunnel/tree/dev/docs
• If you are contributing the connector code, please check that the following files are updated:
  1. Update plugin-mapping.properties and add new connector information in it
  2. Update the pom file of seatunnel-dist
  3. Add ci label in label-scope-conf
  4. Add e2e testcase in seatunnel-e2e
  5. Update connector plugin_config