Bump NHibernate in /RepoDb.Benchmarks/RepoDb.Benchmarks.PostgreSql

Bumps NHibernate from 5.4.6 to 5.4.9.

---
updated-dependencies:
- dependency-name: NHibernate
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

RepoDb.Benchmarks/RepoDb.Benchmarks.PostgreSql/RepoDb.Benchmarks.PostgreSql.csproj

@@ -12,7 +12,7 @@
     <PackageReference Include="linq2db" Version="5.3.2" />
     <PackageReference Include="linq2db.PostgreSQL" Version="5.3.2" />
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="7.0.0" />
-    <PackageReference Include="NHibernate" Version="5.4.6" />
+    <PackageReference Include="NHibernate" Version="5.4.9" />
     <PackageReference Include="Npgsql" Version="7.0.6" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="7.0.0" />
   </ItemGroup>