Update MSAL version to 4.51.0 (#206)

Author: neha-bhargava

src/Microsoft.Identity.Client.Extensions.Msal/Microsoft.Identity.Client.Extensions.Msal.csproj

@@ -36,7 +36,7 @@
   <Import Project="..\Shared\Shared.projitems" Label="Shared" />
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.Identity.Client" Version="4.50.0" />
+    <PackageReference Include="Microsoft.Identity.Client" Version="4.51.0" />
   </ItemGroup>
 
   <ItemGroup Condition="'$(TargetFramework)' == '$(TargetFrameworkNetDesktop)'">