CI: cleanup build warnings

Tests: fixed "unused const variable" warning
CMakeLists.txt: fixed deprecation warnings

src/tcp_server.h

@@ -143,7 +143,7 @@ private:
 	std::vector<uv_tcp_t*> m_listenSockets;
 
 protected:
-	virtual const char* get_category() const { return "TCPServer "; }
+	virtual const char* get_log_category() const;
 
 	std::vector<uint8_t> m_callbackBuf;
 	int m_defaultBacklog;