patch 8.2.3085: JSONC files are not recognized

Problem:    JSONC files are not recognized.
Solution:   Recognize .jsonc files. (Izhak Jakov, closes #8500)

runtime/filetype.vim

@@ -868,6 +868,9 @@ au BufNewFile,BufRead *.json-patch			setf json
 " Jupyter Notebook is also json
 au BufNewFile,BufRead *.ipynb				setf json
 
+" JSONC
+au BufNewFile,BufRead *.jsonc			setf jsonc
+
 " Kixtart
 au BufNewFile,BufRead *.kix			setf kix
 

src/testdir/test_filetype.vim

@@ -260,6 +260,7 @@ let s:filename_checks = {
     \ 'jovial': ['file.jov', 'file.j73', 'file.jovial'],
     \ 'jproperties': ['file.properties', 'file.properties_xx', 'file.properties_xx_xx', 'some.properties_xx_xx_file'],
     \ 'json': ['file.json', 'file.jsonp', 'file.json-patch', 'file.webmanifest', 'Pipfile.lock', 'file.ipynb'],
+    \ 'jsonc': ['file.jsonc'],
     \ 'jsp': ['file.jsp'],
     \ 'kconfig': ['Kconfig', 'Kconfig.debug', 'Kconfig.file'],
     \ 'kivy': ['file.kv'],

src/version.c

@@ -755,6 +755,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    3085,
 /**/
     3084,
 /**/