release(java-sdk): v0.3.2

[jimmyjames]

Release v0.3.2 of Java SDK

Description

• fix: fix token validity check for expiry
• fix: send OAuth2 credentials request as form-urlencoded post
• fix: do not create new http client on every request

References

Review Checklist

• [ ] I have clicked on "allow edits by maintainers".
• [ ] I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev [Provide a link to any relevant PRs in the references section above]
• [ ] The correct base branch is being used, if not main
• [ ] I have added tests to validate that the change in functionality is working as expected