patch 9.1.1763: filetype: kitty config files are not recognized

Problem:  filetype: kitty config files are not recognized
Solution: Detect */kitty/*.conf as kitty filetype, include a syntax
          script (Shawon).

closes: #18280

Signed-off-by: Shawon <mdmoinulhossainshawon@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

src/testdir/test_filetype.vim

@@ -422,6 +422,7 @@ def s:GetFilenameChecks(): dict<list<string>>
     karel: ['file.kl', 'file.KL'],
     kconfig: ['Kconfig', 'Kconfig.debug', 'Kconfig.file', 'Config.in', 'Config.in.host'],
     kdl: ['file.kdl'],
+    kitty: ['kitty.conf', '~/.config/kitty/colorscheme.conf'],
     kivy: ['file.kv'],
     kix: ['file.kix'],
     kotlin: ['file.kt', 'file.ktm', 'file.kts'],

src/version.c

@@ -724,6 +724,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1763,
 /**/
     1762,
 /**/