2.21.1: set version #20095

Job	Run time
build_cmake (ubuntu:25.10, true, true)	5m 24s
build_cmake (alpine:3.23, false, false)	4m 32s
build_make (alpine:3.23)	5m 55s
build_cmake (ubuntu:24.04, true, true)	5m 6s
build_make (ubuntu:24.04)	4m 33s
build_make (ubuntu:25.10)	4m 55s
	30m 25s

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