Bump Npgsql in /LinqToDBPostGisNetTopologySuite.DemoApp

Bumps [Npgsql](https://github.com/npgsql/npgsql) from 4.1.0 to 8.0.3.
- [Release notes](https://github.com/npgsql/npgsql/releases)
- [Commits](npgsql/npgsql@v4.1.0...v8.0.3)

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

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

LinqToDBPostGisNetTopologySuite/LinqToDBPostGisNetTopologySuite.csproj

@@ -22,7 +22,7 @@
     <PackageReference Include="linq2db" Version="3.0.0" />
     <PackageReference Include="NetTopologySuite" Version="2.0.0" />
     <PackageReference Include="NetTopologySuite.IO.PostGis" Version="2.0.0" />
-    <PackageReference Include="Npgsql" Version="4.1.0" />
+    <PackageReference Include="Npgsql" Version="8.0.3" />
     <PackageReference Include="Npgsql.NetTopologySuite" Version="4.1.0" />
   </ItemGroup>