Update integration tests to use host.testcontainers.internal
          #303
        
          
      
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Motivation
While I was running the integration test, I found out that
host.docker.internaldoesn't work correctly on Linux. (It worked on Mac and Windows.)host.docker.internalis used for the container to access the host but the DNS resolution was keeping failing. While I was debugging on it, I also found out that the Testcontainers provideshost.testcontainers.internalfor the same purpose and there's no reason not to use it. https://java.testcontainers.org/features/networking/Modification
host.testcontainers.internalinstead ofhost.docker.internalResult