Prepare release: 8.0rc2 (#4753)

* Prepare release 8.0rc2

Workflow: Release stage 1 - create release PR (Cylc 8+ only), run: 9

* Update CHANGES.md

* Revert "Update CHANGES.md"

This reverts commit a8f64c2.

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: Mel Hall <37735232+datamel@users.noreply.github.com>

CHANGES.md

@@ -29,7 +29,7 @@ creating a new release entry be sure to copy & paste the span tag with the
 updated. Only the first match gets replaced, so it's fine to leave the old
 ones in. -->
 -------------------------------------------------------------------------------
-## __cylc-8.0rc2 (<span actions:bind='release-date'>Upcoming</span>)__
+## __cylc-8.0rc2 (<span actions:bind='release-date'>Released 2022-03-23</span>)__
 
 Second Release Candidate for Cylc 8 suitable for acceptance testing.
 

cylc/flow/__init__.py

@@ -50,7 +50,7 @@ def environ_init():
 
 environ_init()
 
-__version__ = '8.0rc2.dev'
+__version__ = '8.0rc2'
 
 
 def iter_entry_points(entry_point_name):