Fix compatibility with protobuf v30 (#3034)

Partial backport of fixes from ##2966.

Signed-off-by: Steve Peters <scpeters@openrobotics.org>

Author: scpeters

src/systems/log/LogRecord.cc

@@ -298,7 +298,7 @@ bool LogRecordPrivate::Start(const std::string &_logPath,
   if (!validSdfTopic.empty())
   {
     this->sdfPub = this->node.Advertise(validSdfTopic,
-        this->sdfMsg.GetTypeName());
+        std::string(this->sdfMsg.GetTypeName()));
   }
   else
   {

src/systems/triggered_publisher/TriggeredPublisher.cc

@@ -574,8 +574,8 @@ void TriggeredPublisher::Configure(const Entity &,
       info.msgData = msgs::Factory::New(info.msgType, msgStr);
       if (nullptr != info.msgData)
       {
-        info.pub =
-            this->node.Advertise(info.topic, info.msgData->GetTypeName());
+        info.pub = this->node.Advertise(info.topic,
+            std::string(info.msgData->GetTypeName()));
         if (info.pub.Valid())
         {
           this->outputInfo.push_back(std::move(info));