Incompatible with protobuf 30.0

[christian-heusel]

Hello hello, Arch Linux packager here 👋🏻

We have recently started the protobuf 30.0 rebuild and the usbguard package is one of the holdups that came up along the way due to the following compiler error:

src/Library/IPCServerPrivate.cpp:314:87: error: invalid initialization of reference of type 'const std::string&' {aka 'const std::__cxx11::basic_string<char>&'} from expression of type 'google::protobuf::internal::GetTypeNameReturnType' {aka 'std::basic_string_view<char>'}
  314 |     hdr.id = QB_IPC_MSG_USER_START + IPC::messageTypeNameToNumber(message->GetTypeName());
      |                                                                   ~~~~~~~~~~~~~~~~~~~~^~
In file included from src/Library/IPCServerPrivate.hpp:24,
                 from src/Library/IPCServerPrivate.cpp:23:
src/Library/IPCPrivate.hpp:35:57: note: in passing argument 1 of 'uint32_t usbguard::IPC::messageTypeNameToNumber(const std::string&)'
   35 |     uint32_t messageTypeNameToNumber(const std::string& name);
      |                                      ~~~~~~~~~~~~~~~~~~~^~~~

I think this is due to a few string interface changes, see for example the changes from protobuf-c/protobuf-c#762 🤗