Bump spegel to v0.0.20-k3s1 #198

Job	Run time
build / Build	7m 32s
Docker Tests (basics)	1m 28s
E2E Tests (startup)	7m 35s
Docker Tests (bootstraptoken)	54s
E2E Tests (s3)	4m 48s
Docker Tests (cacerts)	1m 37s
Docker Tests (lazypull)	58s
E2E Tests (btrfs)	4m 3s
Docker Tests (upgrade)	25s
E2E Tests (externalip)	5m 43s
E2E Tests (privateregistry)	5m 40s
E2E Tests (wasm)	4m 34s
	45m 17s

Provide feedback