This instance will be upgraded to Heptapod 0.31.0 (final) on 2022-05-24 at 14:00 UTC+2 (a few minutes of down time)

ci-mercurial-core: stop using py2/py3 variante for mercurial-core image

The attempt to have different installation failed (because of tools who need
either py2 or py3). So the two images are not identical. Lets merge then into a
single one.
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