Bump Npgsql in /NET 6.0/Using a Custom Data Adapter

Bumps [Npgsql](https://github.com/npgsql/npgsql) from 5.0.11 to 5.0.18.
- [Release notes](https://github.com/npgsql/npgsql/releases)
- [Commits](npgsql/npgsql@v5.0.11...v5.0.18)

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

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Author: dependabot[bot]

NET 6.0/Using a Custom Data Adapter/Using a Custom Data Adapter.csproj

@@ -6,7 +6,7 @@
     <UseWindowsForms>true</UseWindowsForms>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Npgsql" Version="5.0.11" />
+    <PackageReference Include="Npgsql" Version="5.0.18" />
     <PackageReference Include="Stimulsoft.Reports.Net" Version="2024.2.6" />
   </ItemGroup>
   <ItemGroup>