docs(CHANGES) Strip implementation depth from upgrade-time entries #409

Job	Run time
qa (3.14)	47s
qa (3.13)	27s
qa (3.11)	33s
qa (3.12)	27s
qa (3.10)	32s
packages	21s
docs	31s
smoke (sphinx-gp-theme)	14s
smoke (sphinx-autodoc-docutils)	15s
smoke (gp-sphinx)	14s
smoke (root-install)	9s
smoke (sphinx-autodoc-pytest-fixtures)	10s
smoke (sphinx-fonts)	10s
smoke (sphinx-autodoc-sphinx)	12s
smoke (sphinx-autodoc-fastmcp)	17s
smoke (sphinx-autodoc-argparse)	9s
smoke (sphinx-autodoc-typehints-gp)	12s
smoke (sphinx-autodoc-api-style)	17s
smoke (sphinx-ux-autodoc-layout)	14s
smoke (sphinx-ux-badges)	12s
	6m 23s

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