all: use any instead of interface{}

My favorite part of generics.

Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>

ssh/tailssh/context.go

@@ -42,7 +42,7 @@ func (ctx *sshContext) Err() error {
 
 func (ctx *sshContext) Done() <-chan struct{}                   { return ctx.done }
 func (ctx *sshContext) Deadline() (deadline time.Time, ok bool) { return }
-func (ctx *sshContext) Value(interface{}) interface{}           { return nil }
+func (ctx *sshContext) Value(any) any                           { return nil }
 
 // userVisibleError is a wrapper around an error that implements
 // SSHTerminationError, so msg is written to their session.

ssh/tailssh/incubator_linux.go

@@ -35,7 +35,7 @@ func ptyNameLinux(f *os.File) (string, error) {
 
 // callLogin1 invokes the provided method of the "login1" service over D-Bus.
 // https://www.freedesktop.org/software/systemd/man/org.freedesktop.login1.html
-func callLogin1(method string, flags dbus.Flags, args ...interface{}) (*dbus.Call, error) {
+func callLogin1(method string, flags dbus.Flags, args ...any) (*dbus.Call, error) {
 	conn, err := dbus.SystemBus()
 	if err != nil {
 		// DBus probably not running.
@@ -77,8 +77,8 @@ type createSessionArgs struct {
 	}
 }
 
-func (a createSessionArgs) args() []interface{} {
-	return []interface{}{
+func (a createSessionArgs) args() []any {
+	return []any{
 		a.uid,
 		a.pid,
 		a.service,