build(deps): bump Npgsql in /src/test/csharp/pgadapter_npgsql_tests

Bumps [Npgsql](https://github.com/npgsql/npgsql) from 8.0.5 to 9.0.1.
- [Release notes](https://github.com/npgsql/npgsql/releases)
- [Commits](npgsql/npgsql@v8.0.5...v9.0.1)

---
updated-dependencies:
- dependency-name: Npgsql
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

src/test/csharp/pgadapter_npgsql_tests/npgsql_tests/npgsql_tests.csproj

@@ -9,7 +9,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-      <PackageReference Include="Npgsql" Version="8.0.5" />
+      <PackageReference Include="Npgsql" Version="9.0.1" />
     </ItemGroup>
 
 </Project>