Upgrade cppcheck version

dev-requirements.txt

 pfultz2/rocm-recipes
-pcre
-danmar/cppcheck@575f62f39c1130f412d3cc11b0138c5057c451c0 -DHAVE_RULES=1
+danmar/cppcheck@681cb7dd909d1bfe41796b7616e43265177b9464 -DHAVE_RULES=1
 ROCm-Developer-Tools/HIP@fc22ef991ce7cb15821c8ccb4f03cdfc3e7e43cf
 python/cpython@v3.6.6 -X autotools -H sha256:92aa914572c695c0aeb01b0a214813f414da4b51a371234df514a74761f2bb36
 -f requirements.txt

src/include/migraphx/par_for.hpp

@@ -54,7 +54,6 @@ void par_for_impl(std::size_t n, std::size_t threadsize, F f)
                     f(i);
                 }
             });
-            // cppcheck-suppress unreadVariable
             work += grainsize;
             return result;
         });