13.0-RELEASE schedule update

[Glen Barber]

At least one issue has been brought to our attention that affects new
installations, which as we currently have no precedent for re-rolling
ISOs and/or VM images post-release, warrant adding RC4 to the 13.0
schedule.

Please be advised that we are still only accepting critical changes
only, with the exception of a few post-RC3 requests for approval that
have trickled in.

The updated remaining milestones of the 13.0 schedule have been
committed to the Project website and also follows:

 RC4 build starts:        March 26, 2021
 RELEASE build starts:    April 2, 2021
 RELEASE announcement:    April 6, 2021

As always, thank you for your cooperation and hard work that went into
this release, and thank you to all that have helped test the BETAs and
RCs during this cycle.

Glen
On behalf of:	re@

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