patch 8.2.4855: robot files are not recognized

Problem:    Robot files are not recognized.
Solution:   Add patterns for robot files. (Zoe Roux, closes #10339)

src/testdir/test_filetype.vim

@@ -457,6 +457,7 @@ let s:filename_checks = {
     \ 'rib': ['file.rib'],
     \ 'rnc': ['file.rnc'],
     \ 'rng': ['file.rng'],
+    \ 'robot': ['file.robot', 'file.resource'],
     \ 'robots': ['robots.txt'],
     \ 'routeros': ['file.rsc'],
     \ 'rpcgen': ['file.x'],

src/version.c

@@ -746,6 +746,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    4855,
 /**/
     4854,
 /**/