Bump Npgsql from 6.0.3 to 6.0.4

Bumps [Npgsql](https://github.com/npgsql/npgsql) from 6.0.3 to 6.0.4.
- [Release notes](https://github.com/npgsql/npgsql/releases)
- [Commits](https://github.com/npgsql/npgsql/compare/v6.0.3...v6.0.4)

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

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

OhmGraphite/OhmGraphite.csproj

@@ -36,7 +36,7 @@
 
   <ItemGroup>
     <PackageReference Include="InfluxDB.Client" Version="3.3.0" />
-    <PackageReference Include="Npgsql" Version="6.0.3" />
+    <PackageReference Include="Npgsql" Version="6.0.4" />
     <PackageReference Include="prometheus-net" Version="6.0.0" />
     <PackageReference Include="System.Configuration.ConfigurationManager" Version="6.0.0" />
     <PackageReference Include="TopShelf" Version="4.3.0" />