Update yaml test cases to reflect fact yaml.v3 uses 4 spaces by default

Though this can be customised, see: https://ubuntu.com/blog/api-v3-of-the-yaml-package-for-go-is-available

Signed-off-by: Silas Davis <silas@monax.io>

pkg/chartutil/yaml/from_json.go

@@ -1,6 +1,6 @@
 package yaml
 
-import "gopkg.in/yaml.v2"
+import "gopkg.in/yaml.v3"
 
 // Convert JSON to YAML.
 func FromJSON(j []byte) ([]byte, error) {

pkg/chartutil/yaml/to_json.go

@@ -7,7 +7,7 @@ import (
 	"reflect"
 	"strconv"
 
-	"gopkg.in/yaml.v2"
+	"gopkg.in/yaml.v3"
 )
 
 func ToJSON(y []byte) ([]byte, error) {