Bump core versions to 10.5.3/11.2.4

Now that this issue is closed, please review the contribution record.

As a contributor, attribute any organization helped you, or if you volunteered your own time.

Maintainers, please credit people who helped resolve this issue.

Thanks for doing the version changen quickly. Helps not ot have MRs failing.
Nice to see the new contribution records live, well done on that massive milestone.

Thanks!!