Mirror Build Image: Bump amd64/golang from 1.21.8-bookworm to 1.21.9-bookworm in /mirror/1.21 #1706

Job	Run time
Generate semantic release version using git-describe-semver	9s
Build stable Alpine x64 image using Makefile	51s
Build oldstable Alpine x64 image using Makefile	53s
Build oldstable cgo-mingw-w64 x86 image using Makefile	1m 40s
Build oldstable Alpine x86 image using Makefile	1m 5s
Build oldstable cgo-mingw-w64 x64 image using Makefile	1m 28s
Build stable Alpine x86 image using Makefile	56s
Build stable cgo-mingw-w64 x64 image using Makefile	1m 31s
Build stable cgo-mingw-w64 x86 image using Makefile	1m 42s
Build stable image using Makefile	1m 34s
Build unstable Alpine x64 image using Makefile	53s
Build unstable Alpine x86 image using Makefile	58s
Build unstable cgo-mingw-w64 x64 image using Makefile	1m 29s
Build oldstable image using Makefile	2m 23s
Build stable mirror images using Makefile	26s
Build unstable cgo-mingw-w64 x86 image using Makefile	1m 32s
Build unstable image using Makefile	1m 43s
	21m 13s

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