Use alpine 3.21 for Dockerfile #4153

Job	Run time
package-generic-linux-x64	2m 25s
package-generic-linux-aarch64	23m 22s
package-macos-x64	10m 18s
package-deb-x64	5m 1s
package-macos-aarch64	4m 37s
test-dockerfile-x64	5m 16s
package-windows-x64	30m 55s
test-generic-linux-on-docker-ubuntu-x64	3m 15s
test-generic-linux-on-docker-fedora-x64	2m 33s
test-generic-linux-on-docker-archlinux-x64	2m 39s
test-generic-linux-on-docker-debian-x64	2m 45s
package-anatomy	10s
	1h 33m 16s

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