Bump DotNet.Testcontainers from 1.5.0 to 1.6.0

Bumps [DotNet.Testcontainers](https://github.com/HofmeisterAn/dotnet-testcontainers) from 1.5.0 to 1.6.0.
- [Release notes](https://github.com/HofmeisterAn/dotnet-testcontainers/releases)
- [Commits](https://github.com/HofmeisterAn/dotnet-testcontainers/compare/1.5.0...1.6.0)

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

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

OhmGraphite.Test/OhmGraphite.Test.csproj

@@ -6,7 +6,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="DotNet.Testcontainers" Version="1.5.0" />
+    <PackageReference Include="DotNet.Testcontainers" Version="1.6.0" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.2.0" />
     <PackageReference Include="xunit" Version="2.4.1" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.5" />