Bump version to 7.21.3

[ElizabethOkerio]

Issues

Description

update ODL version to 7.21.3

Checklist (Uncheck if it is not completed)

• [ ] Test cases added
• [ ] Build and test with one-click build and test script passed

Additional work necessary

If documentation update is needed, please add "Docs Needed" label to the issue and provide details about the required document change in the issue.