all: regenerate generated files for new tool versions

The nix dev shell refresh in 758fef9b pulled in protoc-gen-go-grpc
v1.6.1 and newer tailscale.com/cmd/{viewer,cloner}, so rerunning
`make generate` updates the version header comments in the three
affected generated files. No semantic changes.

hscontrol/types/types_clone.go

@@ -1,4 +1,4 @@
-// Copyright (c) Tailscale Inc & AUTHORS
+// Copyright (c) Tailscale Inc & contributors
 // SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.

hscontrol/types/types_view.go

@@ -1,4 +1,4 @@
-// Copyright (c) Tailscale Inc & AUTHORS
+// Copyright (c) Tailscale Inc & contributors
 // SPDX-License-Identifier: BSD-3-Clause
 
 // Code generated by tailscale/cmd/viewer; DO NOT EDIT.