chore: Bump alpine from 3.21.0 to 3.21.2 #571

Job	Run time
Preliminary configuration	1s
build (cert-creator)	54s
liqoctl (linux, arm64)	2m 46s
build (crd-replicator)	34m 54s
liqoctl (linux, amd64)	2m 42s
build (ipam)	33m 33s
liqoctl (linux, arm)	2m 40s
build (liqo-controller-manager)	40m 52s
liqoctl (windows, amd64)	2m 45s
build (webhook)	34m 25s
liqoctl (darwin, arm64)	2m 42s
build (uninstaller)	24m 7s
liqoctl (darwin, amd64)	2m 38s
build (virtual-kubelet)	39m 8s
build (metric-agent)	34m 26s
build (telemetry)	33m 57s
build (proxy)	30m 55s
build (gateway)	33m 27s
build (gateway/wireguard)	37m 57s
build (gateway/geneve)	35m 16s
build (fabric)	33m 47s
post-build	2s
e2e-test-trigger	0s
release	0s
	7h 43m 54s

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