patch 9.0.1423: WebAssembly Interface Type files are not recognized

Problem:    WebAssembly Interface Type files are not recognized.
Solution:   Add a pattern for WIT files. (Amaan Qureshi, closes #12173)

runtime/filetype.vim

@@ -2345,6 +2345,9 @@ au BufNewFile,BufRead *.vue			setf vue
 " WebAssembly
 au BufNewFile,BufRead *.wast,*.wat		setf wast
 
+" WebAssembly Interface Type (WIT)
+au BufNewFile,BufRead *.wit			setf wit
+
 " Webmacro
 au BufNewFile,BufRead *.wm			setf webmacro
 

src/testdir/test_filetype.vim

@@ -663,6 +663,7 @@ let s:filename_checks = {
     \ 'wget': ['.wgetrc', 'wgetrc'],
     \ 'wget2': ['.wget2rc', 'wget2rc'],
     \ 'winbatch': ['file.wbt'],
+    \ 'wit': ['file.wit'],
     \ 'wml': ['file.wml'],
     \ 'wsh': ['file.wsf', 'file.wsc'],
     \ 'wsml': ['file.wsml'],

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1423,
 /**/
     1422,
 /**/