[BUG] Object array in oneof item generate wrong go data structure

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

Object array in oneof item generate wrong go data structure

openapi-generator version

openapi-generator-cli-7.0.0.jar

OpenAPI declaration file content or url

some content of yaml file

openapi: 3.0.3
testOneOfObject:
oneOf:
- type: string
nullable: true
- type: array
items:
type: object

(for JSON code), so it becomes more readable. If it is longer than about ten lines,
please create a Gist (https://gist.github.com) or upload it somewhere else and
link it here.
-->

Generation Details

java -jar ${jar} generate -i ${yamlfile} -g go -o out/test -p packageName=test
The go code is wrong
type TestOneOfObjectstruct {
ArrayOfMapmapOfStringinterface{} *[]map[string]interface{}
String *string
}

ArrayOfMapmapOfStringinterface{} *[]map[string]interface{}  should be ArrayOfMapmapOfStringinterface []map[string]interface{}

If the item type in array is an specific structure, it works well, but it generate wrong go code if the type is object

Steps to reproduce

Related issues/PRs

Suggest a fix

Start by reproducing the issue with the provided OpenAPI 3.0.3 declaration and the java -jar ${jar} generate -g go command. Inspect the generated TestOneOfObject structure and verify that the object-array field is emitted as a slice rather than a pointer to a slice; done means the generated Go code is valid and matches the expected declaration.