fix(deps): update module github.com/elastic/cloud-sdk-go to v1.9.0 (#571)

Co-authored-by: Renovate Bot <bot@renovateapp.com>

Author: renovate[bot]

go.mod

@@ -4,7 +4,7 @@ go 1.13
 
 require (
 	github.com/asaskevich/govalidator v0.0.0-20210307081110-f21760c49a8d
-	github.com/elastic/cloud-sdk-go v1.8.1
+	github.com/elastic/cloud-sdk-go v1.9.0
 	github.com/go-openapi/runtime v0.23.0
 	github.com/go-openapi/strfmt v0.21.2
 	github.com/pkg/errors v0.9.1