highlights(lua): next as builtin function

queries/lua/highlights.scm

@@ -150,6 +150,9 @@
     "rawequal" "rawget" "rawset" "require" "select" "setfenv" "setmetatable"
     "tonumber" "tostring" "type" "unpack" "xpcall"))
 
+;; built-in next function
+(next) @function.builtin
+
 ;; Parameters
 (parameters
   (identifier) @parameter)

tests/query/highlights/lua/test.lua

@@ -0,0 +1,13 @@
+local a = { 1, 2, 3, 4, 5 }
+--          ^ TSNumber    ^ TSPunctBracket
+--    ^ TSVariable
+
+local _ = next(a)
+--          ^ TSFuncBuiltin
+-- ^ TSKeyword
+
+_ = next(a)
+--   ^ TSFuncBuiltin
+
+next(a)
+-- ^ TSFuncBuiltin