Replace std::lock_guard and std::lock with std::scoped_lock (#1758)

std::scoped_lock was introduced in C++17 and is strictly better than
std::lock_guard as it supports locking any number of mutexes safely.
It's also easier to use than std::lock for locking multiple mutexes at
once.

hal/src/main/native/athena/PDP.cpp

@@ -130,7 +130,7 @@ HAL_PDPHandle HAL_InitializePDP(int32_t module, int32_t* status) {
     return HAL_kInvalidHandle;
   }
 
-  std::lock_guard lock(pdpHandleMutex);
+  std::scoped_lock lock(pdpHandleMutex);
 
   if (pdpHandles[module] != HAL_kInvalidHandle) {
     *status = 0;