git-latexdiff: migrate to homebrew/tex tap

Closes Homebrew/homebrew#39463.

Signed-off-by: Xu Cheng <xucheng@me.com>

Library/Homebrew/tap_migrations.rb

@@ -60,6 +60,7 @@ TAP_MIGRATIONS = {
   "ggobi" => "homebrew/x11",
   "giblib" => "homebrew/x11",
   "git-flow-clone" => "homebrew/boneyard",
+  "git-latexdiff" => "homebrew/tex",
   "gkrellm" => "homebrew/x11",
   "glade" => "homebrew/x11",
   "gle" => "homebrew/x11",