fix: Windows build

Author: sjinks

src/os_resource_detector.cpp

@@ -62,15 +62,15 @@ ::opentelemetry::sdk::resource::Resource os_resource_detector::Detect()
     GetSystemInfo(&si);
     switch (si.wProcessorArchitecture) {
         case PROCESSOR_ARCHITECTURE_AMD64:
-            attrs[kHostArch] = std::string(HostArchValues::kAmd64);
+            attrs[kHostArch] = std::string(kAmd64);
             break;
 
         case PROCESSOR_ARCHITECTURE_INTEL:
-            attrs[kHostArch] = std::string(HostArchValues::kX86);
+            attrs[kHostArch] = std::string(kX86);
             break;
 
         case PROCESSOR_ARCHITECTURE_ARM64:
-            attrs[kHostArch] = std::string(HostArchValues::kArm64);
+            attrs[kHostArch] = std::string(kArm64);
             break;
 
         default: