Plan for JMC 8.3

[Marcus Hirt]

Hi all,

I am hereby proposing the following plan for JMC 8.3.

Plan:
* RDS 2022-08-03
* RDP2 2022-08-31
* GA 2022-09-28

It is off-set by a quarter compared to our normal cadence due to various
scheduling issues. Note that this is planned to be the last release of JMC
8, and that work on JMC 9 will be the main effort after this release.

Please let me know if you have any concerns!

Kind regards,
Marcus