Bump sdk for workload testing to 6.0.100-rc.1.21425.15

Author: radical

eng/Versions.props

@@ -163,7 +163,7 @@
     <SQLitePCLRawbundle_greenVersion>2.0.4</SQLitePCLRawbundle_greenVersion>
     <MoqVersion>4.12.0</MoqVersion>
     <FsCheckVersion>2.14.3</FsCheckVersion>
-    <SdkVersionForWorkloadTesting>6.0.100-rc.1.21412.8</SdkVersionForWorkloadTesting>
+    <SdkVersionForWorkloadTesting>6.0.100-rc.1.21425.15</SdkVersionForWorkloadTesting>
     <!-- Docs -->
     <MicrosoftPrivateIntellisenseVersion>5.0.0-preview-20201009.2</MicrosoftPrivateIntellisenseVersion>
     <!-- ILLink -->