add missing keywords to parser fuzzer dict from PHP 7.4 to 8.3 (#13160)

* Added missing keywords to parser fuzzer dict from PHP 7.4 to 8.3

* Added null return type

Author: jorgsowa

sapi/fuzzer/dict/parser

@@ -4,6 +4,7 @@
 "function"
 "const"
 "return"
+"mixed"
 "yield"
 "yield from"
 "try"
@@ -29,6 +30,7 @@
 "endswitch"
 "case"
 "default"
+"match"
 "break"
 "continue"
 "goto"
@@ -46,13 +48,18 @@
 "integer"
 "float"
 "double"
+"never"
+"void"
 "real"
 "string"
 "binary"
 "array"
 "object"
 "bool"
 "boolean"
+"true"
+"false"
+"null"
 "unset"
 "eval"
 "include"
@@ -72,9 +79,12 @@
 "private"
 "protected"
 "public"
+"readonly"
+"enum"
 "unset"
 "list"
 "callable"
+"iterable"
 "__class__"
 "__trait__"
 "__function__"