Bump System.IdentityModel.Tokens.Jwt from 6.9.0 to 6.12.0 (#330)

Bumps [System.IdentityModel.Tokens.Jwt](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet) from 6.9.0 to 6.12.0.
- [Release notes](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/releases)
- [Changelog](https://github.com/AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet/blob/dev/CHANGELOG.md)
- [Commits](AzureAD/azure-activedirectory-identitymodel-extensions-for-dotnet@6.9.0...6.12.0)

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src/IdentityTokenValidator/IdentityTokenValidator.csproj

@@ -36,7 +36,7 @@
     <ItemGroup>
         <PackageReference Include="minver" Version="2.5.0" PrivateAssets="All" />
 
-        <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="6.11.0" />
+        <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="6.12.0" />
         <PackageReference Include="Microsoft.Extensions.Logging" Version="5.0.0" />
         <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
     </ItemGroup>

test/OidcClient.Tests/OidcClient.Tests.csproj

@@ -19,7 +19,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="6.9.0" />
+    <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="6.12.0" />
 
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.9.4" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />