chore(cdn): Update to new SDK version 1.21

Signed-off-by: Alexander Dahmen <alexander.dahmen@inovex.de>

Author: Fyusel

internal/cmd/beta/cdn/distribution/list/list_test.go

@@ -258,6 +258,9 @@ func fixtureDistributions(count int) []cdn.Distribution {
 				Tls: cdn.TlsConfig{
 					AdditionalProperties: map[string]interface{}{},
 				},
+				CacheConfig: cdn.CacheConfig{
+					AdditionalProperties: map[string]interface{}{},
+				},
 				Regions:              []cdn.Region{cdn.REGION_EU},
 				BlockedCountries:     []string{},
 				BlockedIps:           []string{},