chore(deps): update dependency nhibernate to v5.4.9 [security]

Author: renovate[bot]

src/NHibernate.Search/NHibernate.Search.Lucene.csproj

@@ -14,7 +14,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Lucene.Net.QueryParser" Version="4.8.0-beta00016" NoWarn="NU5104" />
-    <PackageReference Include="NHibernate" Version="5.3.13" />
+    <PackageReference Include="NHibernate" Version="5.4.9" />
   </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)' == 'net461'">
     <Reference Include="System.Configuration" />