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: #14357

Signed-off-by: Wu, Zhenyu <wuzhenyu@ustc.edu>
Signed-off-by: Christian Brabandt <cb@256bit.org>

runtime/filetype.vim

@@ -1241,8 +1241,8 @@ au BufNewFile,BufRead *.lot,*.lotos		setf lotos
 " Lout (also: *.lt)
 au BufNewFile,BufRead *.lou,*.lout		setf lout
 
-" Lua
-au BufNewFile,BufRead *.lua			setf lua
+" Lua, Texlua
+au BufNewFile,BufRead *.lua,*.tlu		setf lua
 
 " Luau
 au BufNewFile,BufRead *.luau		setf luau

src/testdir/test_filetype.vim

@@ -396,7 +396,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     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'],

src/version.c

@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    236,
 /**/
     235,
 /**/