Updating WPFVisualizer Cert (#9290)

Co-authored-by: Satwik Kumar Sharma <satwiksharma@microsoft.com>

Author: SatwikKrSharma

source/dotnet/Samples/WPFVisualizer.PackageProject/AdaptiveCards.Sample.WPFVisualizer.PackageProject.wapproj

@@ -43,7 +43,7 @@
     <DefaultLanguage>en-US</DefaultLanguage>
     <PackageCertificateKeyFile>AdaptiveCards.Sample.WPFVisualizer.PackageProject_TemporaryKey.pfx</PackageCertificateKeyFile>
     <EntryPointProjectUniqueName>..\WPFVisualizer\AdaptiveCards.Sample.WPFVisualizer.csproj</EntryPointProjectUniqueName>
-    <PackageCertificateThumbprint>3bd5fc86b707a862b32aa301f34e37c77de44a11</PackageCertificateThumbprint>
+    <PackageCertificateThumbprint>EC31E8FE4FFAAA30604BDACABF17F0CEAA1F8CC5</PackageCertificateThumbprint>
     <AppxPackageSigningEnabled>True</AppxPackageSigningEnabled>
   </PropertyGroup>
   <ItemGroup>