src: fix data type when using uv_get_total_memory()

PR-URL: #26886
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>

src/api/environment.cc

@@ -169,7 +169,7 @@ void SetIsolateCreateParams(Isolate::CreateParams* params,
   if (allocator != nullptr)
     params->array_buffer_allocator = allocator;
 
-  double total_memory = uv_get_total_memory();
+  const uint64_t total_memory = uv_get_total_memory();
   if (total_memory > 0) {
     // V8 defaults to 700MB or 1.4GB on 32 and 64 bit platforms respectively.
     // This default is based on browser use-cases. Tell V8 to configure the