Bump etcd to v3.5.18 #555

Job	Run time
Build Go Tests	1m 35s
build / Build	7m 44s
E2E Tests (autoimport)	5m 42s
E2E Tests (startup)	10m 13s
Docker Tests (basics)	1m 3s
Docker Tests In GO	0s
E2E Tests (s3)	8m 22s
Docker Tests (bootstraptoken)	49s
E2E Tests (btrfs)	4m 29s
Docker Tests (cacerts)	47s
E2E Tests (externalip)	4m 51s
Docker Tests (compat)	1m 30s
E2E Tests (privateregistry)	6m 18s
Docker Tests (lazypull)	45s
E2E Tests (embeddedmirror)	5m 0s
Docker Tests (upgrade)	2m 16s
E2E Tests (wasm)	5m 21s
	1h 6m 45s

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