update abstractions to 8.1.0 (#3224)

Author: jennyf19

Directory.Build.props

@@ -96,7 +96,7 @@
     <MicrosoftGraphVersion>4.36.0</MicrosoftGraphVersion>
     <MicrosoftGraphBetaVersion>4.57.0-preview</MicrosoftGraphBetaVersion>
     <MicrosoftExtensionsHttpVersion>3.1.3</MicrosoftExtensionsHttpVersion>
-    <MicrosoftIdentityAbstractionsVersion>8.0.0</MicrosoftIdentityAbstractionsVersion>
+    <MicrosoftIdentityAbstractionsVersion>8.1.0</MicrosoftIdentityAbstractionsVersion>
     <!--CVE-2024-43485-->
     <SystemTextJsonVersion>8.0.5</SystemTextJsonVersion>
     <!--CVE-2023-29331-->