Update dependency WireMock.Net to 1.8.12

Author: renovate[bot]

tests/TBC.OpenAPI.SDK.OnlineInstallments.Tests/TBC.OpenAPI.SDK.OnlineMortgage.Tests.csproj

@@ -13,7 +13,7 @@
     <PackageReference Include="FluentAssertions" Version="6.7.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
     <PackageReference Include="Moq" Version="4.18.2" />
-    <PackageReference Include="WireMock.Net" Version="1.5.3" />
+    <PackageReference Include="WireMock.Net" Version="1.8.12" />
   </ItemGroup>
 
   <ItemGroup>