Update dependency NHibernate to 5.5.3

Author: dependencyupdates[bot]

src/TimeoutMigrationTool/TimeoutMigrationTool.csproj

@@ -23,7 +23,7 @@
     <PackageReference Include="Microsoft.Data.SqlClient" Version="5.2.2" />
     <PackageReference Include="Microsoft.Extensions.Logging.Abstractions" Version="8.0.3" />
     <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
-    <PackageReference Include="NHibernate" Version="5.5.2" />
+    <PackageReference Include="NHibernate" Version="5.5.3" />
     <PackageReference Include="Particular.Packaging" Version="4.5.0" PrivateAssets="All" />
     <PackageReference Include="RabbitMQ.Client" Version="6.8.1" />
     <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="8.2.1" />