vim-patch:9.1.0111: filetype: no support for bats files

The '*.bats' file type is for Bash Automated Testing System (BATS)
scripts. BATS scripts are Bash with a special '@test' extension but they
otherwise work with Vim's bash filetype.

See https://github.com/bats-core/bats-core

closes: vim/vim#14039

d00fb4b3a2

Co-authored-by: Brandon Maier <brandon.maier@collins.com>

runtime/lua/vim/filetype.lua

@@ -910,6 +910,7 @@ local extension = {
   sed = 'sed',
   sexp = 'sexplib',
   bash = detect.bash,
+  bats = detect.bash,
   ebuild = detect.bash,
   eclass = detect.bash,
   env = detect.sh,