tiptop: get patch from salsa.debian.org

http://anonscm.debian.org/cgit is not available anymore

pkgs/os-specific/linux/tiptop/default.nix

@@ -11,8 +11,7 @@ stdenv.mkDerivation rec {
 
   patches = [(fetchpatch {
     name = "reproducibility.patch";
-    url = "http://anonscm.debian.org/cgit/collab-maint/tiptop.git/plain/debian/"
-      + "patches/0001-fix-reproducibility-of-build-process.patch?id=c777d0d5803";
+    url = "https://salsa.debian.org/debian/tiptop/raw/debian/2.3.1-1/debian/patches/0001-fix-reproducibility-of-build-process.patch";
     sha256 = "116l7n3nl9lj691i7j8x0d0za1i6zpqgghw5d70qfpb17c04cblp";
   })];