build(deps): bump Testcontainers.PostgreSql and Testcontainers

Bumps [Testcontainers.PostgreSql](https://github.com/testcontainers/testcontainers-dotnet) and [Testcontainers](https://github.com/testcontainers/testcontainers-dotnet). These dependencies needed to be updated together.

Updates `Testcontainers.PostgreSql` from 3.8.0 to 3.9.0
- [Release notes](https://github.com/testcontainers/testcontainers-dotnet/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-dotnet/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/testcontainers/testcontainers-dotnet/commits)

Updates `Testcontainers` from 3.8.0 to 3.9.0
- [Release notes](https://github.com/testcontainers/testcontainers-dotnet/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-dotnet/blob/develop/CHANGELOG.md)
- [Commits](https://github.com/testcontainers/testcontainers-dotnet/commits)

---
updated-dependencies:
- dependency-name: Testcontainers.PostgreSql
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: Testcontainers
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Directory.Packages.props

@@ -25,8 +25,8 @@
  <PackageVersion Include="NSubstitute" Version="5.1.0" />
  <PackageVersion Include="XunitXml.TestLogger" Version="3.1.20" />
  <PackageVersion Include="coverlet.collector" Version="6.0.2" />
- <PackageVersion Include="Testcontainers" Version="3.8.0" />
- <PackageVersion Include="Testcontainers.PostgreSql" Version="3.8.0" />
+ <PackageVersion Include="Testcontainers" Version="3.9.0" />
+ <PackageVersion Include="Testcontainers.PostgreSql" Version="3.9.0" />
  <PackageVersion Include="Testcontainers.MariaDb" Version="3.8.0" />
  <PackageVersion Include="Testcontainers.Oracle" Version="3.8.0" />
  <PackageVersion Include="Testcontainers.MsSql" Version="3.8.0" />