Updated health-data-standards for 4.0.4 release

[hossenlopp]

Updates the gemspec version for 4.0.4 release

Pull requests into Health Data Standards require the following. Submitter and reviewer should :white_check_mark: when done. For items that are not-applicable, note it's not-applicable ("N/A") and :white_check_mark:.

Submitter:

• [x] This pull request describes why these changes were made.
• [x] This PR is into the correct branch.
• [x] Internal ticket for this PR: https://jira.mitre.org/browse/BONNIE-1451
• [x] Internal ticket links back to this PR
• [x] Code diff has been done and been reviewed (it does not contain: additional white space, not applicable code changes, debug statements, etc.)

Bonnie Reviewer:

Name:

• [x] Code is maintainable and reusable, reuses existing code and infrastructure where appropriate, and accomplishes the task’s purpose
• [x] The tests appropriately test the new code, including edge cases
• [x] You have tried to break the code