Update cppcheck to 2.20.0 (xmake-io#9498)

Author: waruqi

packages/c/cppcheck/xmake.lua

@@ -4,6 +4,7 @@ package("cppcheck")
     set_description("A static analysis tool for C/C++ code")
 
     add_urls("https://github.com/danmar/cppcheck/archive/refs/tags/$(version).tar.gz")
+    add_versions("2.20.0", "7be7992439339017edb551d8e7d2315f9bb57c402da50c2cee9cd0e2724600a1")
     add_versions("2.19.1", "49bdf1d7826d60053575b78d3192d81d54970dbfb356590f7476de250b1a4234")
     add_versions("2.18.3", "e37c94e190cdddc65682649b02b72939761585bddd8ada595f922e190a26a2be")
     add_versions("2.18.1", "528841c0f00de5ed41428269df7a30b102af0b1f8ad50f5b7d4ee2997b54c04c")