Update CHANGELOG for v0.21.11 release #2035

Job	Run time
Generate semantic release version using git-describe-semver	5s
Build stable Alpine x64 image using Makefile	53s
Build stable image using Makefile	1m 33s
Build oldstable Alpine x86 image using Makefile	55s
Build oldstable cgo-mingw-w64 x86 image using Makefile	1m 31s
Build oldstable cgo-mingw-w64 x64 image using Makefile	1m 36s
Build oldstable Alpine x64 image using Makefile	52s
Build stable Alpine x86 image using Makefile	1m 0s
Build unstable Alpine x86 image using Makefile	1m 3s
Build unstable Alpine x64 image using Makefile	58s
Build oldstable image using Makefile	1m 34s
Build stable cgo-mingw-w64 x64 image using Makefile	1m 25s
Build stable mirror images using Makefile	34s
Build unstable cgo-mingw-w64 x64 image using Makefile	1m 25s
Build stable cgo-mingw-w64 x86 image using Makefile	1m 34s
Build unstable image using Makefile	1m 35s
Build unstable cgo-mingw-w64 x86 image using Makefile	1m 32s
	20m 5s

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