patch 9.1.2061: filetype: Koka files are not recognized

Problem:  filetype: Koka files are not recognized
Solution: Detect *.kk files as koka filetype (Hoang Nguyen).

Reference:
- https://koka-lang.github.io/koka/doc/index.html

closes: #19104

Signed-off-by: Hoang Nguyen <folliekazetani@protonmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: folliehiyuki

runtime/autoload/dist/ft.vim

@@ -2234,6 +2234,8 @@ const ft_from_ext = {
   "k": "kwt",
   # Kivy
   "kv": "kivy",
+  # Koka
+  "kk": "koka",
   # Kos
   "kos": "kos",
   # Kotlin

src/testdir/test_filetype.vim

@@ -432,6 +432,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     kitty: ['kitty.conf', '~/.config/kitty/colorscheme.conf'],
     kivy: ['file.kv'],
     kix: ['file.kix'],
+    koka: ['file.kk'],
     kos: ['file.kos'],
     kotlin: ['file.kt', 'file.ktm', 'file.kts'],
     krl: ['file.sub', 'file.Sub', 'file.SUB'],

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2061,
 /**/
     2060,
 /**/