Add patch for kytea 0.4.6

Official zip of kytea 0.4.6 is still broken for mac.
I will patch following fix.
 https://github.com/neubig/kytea/pull/8

After merging this PR, I believe CI will pass.
Then I want to merge #30623
I force pushed changing to `.diff`.
BTW, what does "upstream" mean?
Do you mean I have to modify tar.gz file, or I should merge this fix to #30623?