Images: Use latest Alpine 3.20 everywhere. #10385

Job	Run time
changes	7s
test-go	3m 51s
Verify Doc generation	12s
Build	13m 2s
Helm chart lint	49s
Helm chart testing (v1.28.13)	1h 10m 58s
Helm chart testing (v1.29.8)	1h 0m 55s
Helm chart testing (v1.30.4)	1h 10m 56s
Helm chart testing (v1.31.0)	1h 10m 46s
Kubernetes chroot (v1.29.8) / Kubernetes CHROOT	49m 30s
Kubernetes chroot (v1.28.13) / Kubernetes CHROOT	46m 36s
Kubernetes chroot (v1.30.4) / Kubernetes CHROOT	47m 5s
Kubernetes chroot (v1.31.0) / Kubernetes CHROOT	46m 40s
Kubernetes (v1.28.13) / Kubernetes	45m 13s
Kubernetes (v1.29.8) / Kubernetes	46m 17s
Kubernetes (v1.30.4) / Kubernetes	44m 50s
Kubernetes (v1.31.0) / Kubernetes	45m 28s
	11h 3m 15s

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