Bump golang.org/x/mod from 0.17.0 to 0.21.0 #10143

Job	Run time
Preliminary configuration	1s
build (cert-creator)	33s
liqoctl (linux, arm64)	2m 36s
build (crd-replicator)	33m 5s
liqoctl (linux, amd64)	2m 46s
build (ipam)	35m 27s
liqoctl (linux, arm)	2m 31s
build (liqo-controller-manager)	41m 1s
liqoctl (windows, amd64)	2m 37s
build (webhook)	31m 59s
liqoctl (darwin, arm64)	2m 30s
build (uninstaller)	22m 31s
liqoctl (darwin, amd64)	2m 38s
build (virtual-kubelet)	38m 1s
build (metric-agent)	30m 17s
build (telemetry)	31m 26s
build (proxy)	19s
build (gateway)	36m 58s
build (gateway/wireguard)	35m 33s
build (gateway/geneve)	31m 31s
build (fabric)	35m 30s
post-build	3s
release	0s
e2e-test-trigger	0s
	6h 59m 53s

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