Bump Npgsql in /frameworks/CSharp/aspnetcore/src/Platform (#9006)

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

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

frameworks/CSharp/aspnetcore/src/Platform/Platform.csproj

@@ -19,7 +19,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <PackageReference Include="Npgsql" Version="8.0.1" />
+    <PackageReference Include="Npgsql" Version="8.0.3" />
     <PackageReference Include="MySqlConnector" Version="2.3.1" />
     <PackageReference Include="Dapper" Version="2.1.21" />
     <PackageReference Include="RazorSlices" Version="0.7.0" Condition="$(PublishAot) != 'true'" />