vendor: Mega update all dependencies

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4080

vendor/github.com/cznic/fileutil/fileutil_openbsd.go

@@ -9,6 +9,8 @@ import (
 	"os"
 )
 
+const hasPunchHole = false
+
 // PunchHole deallocates space inside a file in the byte range starting at
 // offset and continuing for len bytes. Similar to FreeBSD, this is
 // unimplemented.