fix(diagnostic_graph_aggregator): fix cppcheck warning of functionStatic (#8266)

* fix: deal with functionStatic warning

Signed-off-by: taisa1 <kento.osa@tier4.jp>

* suppress warning by comment

Signed-off-by: taisa1 <kento.osa@tier4.jp>

---------

Signed-off-by: taisa1 <kento.osa@tier4.jp>

Author: taisa1

system/diagnostic_graph_aggregator/src/common/graph/units.hpp

@@ -32,7 +32,7 @@ class UnitLink
 public:
   void initialize_object(BaseUnit * parent, BaseUnit * child);
   void initialize_struct();
-  void initialize_status();
+  void initialize_status();  // cppcheck-suppress functionStatic
   DiagLinkStruct create_struct() const { return struct_; }
   DiagLinkStatus create_status() const { return status_; }
   BaseUnit * parent() const { return parent_; }