vim-patch:9.1.0236: filetype: texlua files are not recognized

Problem:  filetype: texlua files are not recognized
Solution: Add '*.tlu' pattern for texlua files (Wu, Zhenyu)

Reference: https://github.com/TeX-Live/texdoc/tree/master/script

closes: vim/vim#14357

a75f4791b1

Co-authored-by: Wu, Zhenyu <wuzhenyu@ustc.edu>

runtime/lua/vim/filetype.lua

@@ -637,6 +637,7 @@ local extension = {
   nse = 'lua',
   rockspec = 'lua',
   lua = 'lua',
+  tlu = 'lua',
   luau = 'luau',
   lrc = 'lyrics',
   m = detect.m,

test/old/testdir/test_filetype.vim

@@ -386,7 +386,7 @@ func s:GetFilenameChecks() abort
     \ 'lpc': ['file.lpc', 'file.ulpc'],
     \ 'lsl': ['file.lsl'],
     \ 'lss': ['file.lss'],
-    \ 'lua': ['file.lua', 'file.rockspec', 'file.nse', '.luacheckrc', '.busted'],
+    \ 'lua': ['file.lua', 'file.tlu', 'file.rockspec', 'file.nse', '.luacheckrc', '.busted'],
     \ 'luau': ['file.luau'],
     \ 'lynx': ['lynx.cfg'],
     \ 'lyrics': ['file.lrc'],