MM-32961: Bump dependencies (#17016)

Ran `make update-dependencies`

https://mattermost.atlassian.net/browse/MM-32961

vendor/github.com/ulikunitz/xz/bits.go

@@ -1,4 +1,4 @@
-// Copyright 2014-2019 Ulrich Kunitz. All rights reserved.
+// Copyright 2014-2021 Ulrich Kunitz. All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.