README: add link to issue #622

Job	Run time
macOS-latest (oldrel, none)	1m 40s
macOS-latest (release, none)	1m 44s
windows-latest (oldrel, none)	9m 23s
windows-latest (release, none)	4m 57s
windows-latest (devel, none)	14m 19s
ubuntu-22.04 (release, none)	2m 21s
macOS-latest (release, macos-brew)	12m 32s
windows-latest (release, chocolatey)	15m 56s
windows-latest (release, chocolatey-ltr)	18m 19s
windows-latest (devel, chocolatey)	11m 32s
ubuntu-22.04 (release, ubuntu-nightly)	10m 34s
ubuntu-22.04 (devel, ubuntu-nightly)	42m 6s
ubuntu-22.04 (release, ubuntugis)	10m 2s
ubuntu-22.04 (release, ubuntu)	13m 25s
ubuntu-22.04 (release [hard-deps], ubuntu)	6m 40s
ubuntu-22.04 (release, ubuntu-ltr)	8m 45s
	3h 4m 15s

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