Update Messagepack dependency

Author: wtgodbe

eng/Versions.props

@@ -294,7 +294,7 @@
     <GrpcAuthVersion>2.64.0</GrpcAuthVersion>
     <GrpcNetClientVersion>2.64.0</GrpcNetClientVersion>
     <GrpcToolsVersion>2.64.0</GrpcToolsVersion>
-    <MessagePackVersion>2.5.108</MessagePackVersion>
+    <MessagePackVersion>2.5.187</MessagePackVersion>
     <MicrosoftIdentityWebVersion>3.0.0</MicrosoftIdentityWebVersion>
     <MicrosoftIdentityWebGraphServiceClientVersion>3.0.0</MicrosoftIdentityWebGraphServiceClientVersion>
     <MicrosoftIdentityWebUIVersion>3.0.0</MicrosoftIdentityWebUIVersion>