Update origin in patches

debian/patches/1707293949.v1.0.0-3-g8164e8f.adding-filepath-clean-to-address-directory-traversal-2.patch

@@ -1,5 +1,5 @@
 Subject: Adding filepath.Clean to address directory traversal #2
-Origin: https://github.com/openfibernet/tftp-proxy/pull/3
+Origin: upstream, https://github.com/openfibernet/tftp-proxy/pull/3
 Upstream-Author: Arnoud Vermeer <avermeer@tucows.com>
 Date: Wed Feb 7 09:19:09 2024 +0100