Update SBRP version & commit (#2631)

Author: dseefeld

eng/Version.Details.xml

@@ -5,9 +5,9 @@
       <Uri>https://github.com/dotnet/arcade</Uri>
       <Sha>6eec4404c2df5bfa46e5da52383c881c5cca3a9f</Sha>
     </Dependency>
-    <Dependency Name="Private.SourceBuild.ReferencePackages" Version="1.0.0-beta.21307.1">
+    <Dependency Name="Private.SourceBuild.ReferencePackages" Version="1.0.0-beta.21566.2">
       <Uri>https://github.com/dotnet/source-build-reference-packages</Uri>
-      <Sha>5f10a4b951be1d0f2966aca0702b0348bbf5f7c1</Sha>
+      <Sha>6ce5818b1c1828ccdc8ac63d460d029c6391a401</Sha>
     </Dependency>
   </ToolsetDependencies>
   <ProductDependencies>