cppdap: include/dap/network.h: add <stdint.h> include for GCC 15

GCC 15 requires the include for the declaration of `uint32_t`.
Backport [cppdap PR 133](https://github.com/google/cppdap/pull/133).

Utilities/cmcppdap/include/dap/network.h

@@ -17,6 +17,7 @@
 
 #include <functional>
 #include <memory>
+#include <stdint.h>
 
 namespace dap {
 class ReaderWriter;