fix(dropdown): fixed accessibility issue, added aria-expanded

[gerus-virtru]

Proposed Changes

Please use the Jira Key followed by the changes

• JIRAKEY-1234
  • Some change
  • Another change

Checklist

• [ ] I have added or updated unit tests
• [ ] I have added or updated integration tests (if appropriate)
• [ ] I have added or updated documentation / readme (if appropriate)
• [ ] I have verified that my changes have not introduced new lint errors
• [ ] I have added a GitHub labels to the PR for either patch, minor, or major

Testing Instructions