Update vendor

vendor/github.com/mattermost/mattermost-server/v6/model/audits.go

@@ -0,0 +1,14 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+package model
+
+type Audits []Audit
+
+func (o Audits) Etag() string {
+	if len(o) > 0 {
+		// the first in the list is always the most current
+		return Etag(o[0].CreateAt)
+	}
+	return ""
+}