Sort out access permissions for release calendar

[adamfarley]

Summary

As per the retro, this is a request to sort out the access permissions for the release calendar.

Details

Shelley Lambert's original comment.

[sxa]

I have created the entries for the next year, which was the primary comment in the retrospective.

Ref access control. It is not possible to share write access to the existing calendar outside of the adoptopenjdk google organisation, so unfortunately that will be restricted unless we redo the calendar from a non-org account.