The release-notes template hardcoded "base v1.14.0-alpha.35"; it went stale and
had to be hand-edited on rc.14, rc.15 and rc.16 (each was actually on alpha.36).
Resolve the base dynamically in the "Resolve tag" step: take the highest alpha.NN
named in any "Merge upstream" commit subject (robust on a fork without upstream
tags fetched), falling back to git describe against upstream alpha tags, then a
generic v1.14.x label. The notes line now interpolates steps.ver.outputs.base.
Leadaxe
51b3bd07a8