Bump SdkVersionForWorkloadTesting to use a 200 band SDK

dotnet#62787 bumped the manifest id.  This change bumps the prop for testing.

Author: Steve Pfister

eng/Versions.props

@@ -162,7 +162,7 @@
     <SQLitePCLRawbundle_greenVersion>2.0.4</SQLitePCLRawbundle_greenVersion>
     <MoqVersion>4.12.0</MoqVersion>
     <FsCheckVersion>2.14.3</FsCheckVersion>
-    <SdkVersionForWorkloadTesting>6.0.100-rtm.21480.21</SdkVersionForWorkloadTesting>
+    <SdkVersionForWorkloadTesting>6.0.200-preview.22055.18</SdkVersionForWorkloadTesting>
     <!-- Docs -->
     <MicrosoftPrivateIntellisenseVersion>6.0.0-preview-20211019.1</MicrosoftPrivateIntellisenseVersion>
     <!-- ILLink -->