Bump Npgsql from 8.0.1 to 8.0.3 in /tests/client_tests/stock_npgsql

Bumps [Npgsql](https://github.com/npgsql/npgsql) from 8.0.1 to 8.0.3.
- [Release notes](https://github.com/npgsql/npgsql/releases)
- [Commits](npgsql/npgsql@v8.0.1...v8.0.3)

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

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

Author: dependabot[bot]

tests/client_tests/stock_npgsql/stock_npgsql.csproj

@@ -7,7 +7,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.EntityFrameworkCore" Version="8.0.0" />
-    <PackageReference Include="Npgsql" Version="8.0.1" />
+    <PackageReference Include="Npgsql" Version="8.0.3" />
     <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="8.0.0" />
   </ItemGroup>