Switching to OSArchitecture

based on https://learn.microsoft.com/en-us/dotnet/api/system.runtime.interopservices.runtimeinformation.osarchitecture?view=net-9.0

src/OpenTelemetry.Resources.Host/HostDetector.cs

@@ -120,7 +120,7 @@ public Resource Detect()
             }
 
 #if !NETFRAMEWORK
-            var arch = MapArchitectureToOtel(RuntimeInformation.ProcessArchitecture);
+            var arch = MapArchitectureToOtel(RuntimeInformation.OSArchitecture);
             if (arch != null)
             {
                 attributes.Add(new(HostSemanticConventions.AttributeHostArch, arch));