Bump NSubstitute from 5.1.0 to 5.3.0 (#967)

Author: dependabot[bot]

Directory.Packages.props

@@ -8,7 +8,7 @@
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.10" />
     <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.10" />
     <PackageVersion Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="7.0.3" />
-    <PackageVersion Include="NSubstitute" Version="5.1.0" />
+    <PackageVersion Include="NSubstitute" Version="5.3.0" />
     <PackageVersion Include="Shouldly" Version="4.2.1" />
     <PackageVersion Include="StyleCop.Analyzers" Version="1.2.0-beta.556" />
   </ItemGroup>