Bump Npgsql from 7.0.2 to 7.0.4 (#1926)

Bumps [Npgsql](https://github.com/npgsql/npgsql) from 7.0.2 to 7.0.4.
- [Release notes](https://github.com/npgsql/npgsql/releases)
- [Commits](npgsql/npgsql@v7.0.2...v7.0.4)

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

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

src/HealthChecks.NpgSql/HealthChecks.NpgSql.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Npgsql" Version="7.0.2" />
+    <PackageReference Include="Npgsql" Version="7.0.4" />
     <PackageReference Include="Microsoft.Extensions.Diagnostics.HealthChecks" Version="7.0.3" />
   </ItemGroup>