[release/8.0] Bump Microsoft.Private.IntelliSense package version (#92254)

Author: carlossanlop

eng/Versions.props

@@ -209,7 +209,7 @@
     <SdkVersionForWorkloadTesting>8.0.100-rc.1.23415.5</SdkVersionForWorkloadTesting>
     <CompilerPlatformTestingVersion>1.1.2-beta1.23323.1</CompilerPlatformTestingVersion>
     <!-- Docs -->
-    <MicrosoftPrivateIntellisenseVersion>8.0.0-preview-20230828.1</MicrosoftPrivateIntellisenseVersion>
+    <MicrosoftPrivateIntellisenseVersion>8.0.0-preview-20230918.1</MicrosoftPrivateIntellisenseVersion>
     <!-- ILLink -->
     <MicrosoftNETILLinkTasksVersion>8.0.0-rc.1.23406.6</MicrosoftNETILLinkTasksVersion>
     <!-- Mono Cecil -->