Upgrading server dependancies (#6984)

vendor/github.com/prometheus/common/config/config.go

@@ -28,3 +28,20 @@ func checkOverflow(m map[string]interface{}, ctx string) error {
 	}
 	return nil
 }
+
+// Secret special type for storing secrets.
+type Secret string
+
+// MarshalYAML implements the yaml.Marshaler interface for Secrets.
+func (s Secret) MarshalYAML() (interface{}, error) {
+	if s != "" {
+		return "<secret>", nil
+	}
+	return nil, nil
+}
+
+//UnmarshalYAML implements the yaml.Unmarshaler interface for Secrets.
+func (s *Secret) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	type plain Secret
+	return unmarshal((*plain)(s))
+}