upgrade test containers and fix issues

[derrickaw]

1. Issues seen in Bump github.com/testcontainers/testcontainers-go from 0.40.0 to 0.42.0 in /sdks #38433
2. nat is not a dependency anymore so removed

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[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the testcontainers-go dependency to version v0.42.0 to improve build stability and address issues identified in recent test runs. The transition necessitated the removal of the deprecated nat package from the Go SDK integration tests, requiring minor refactoring of helper functions to handle port definitions as strings. These changes ensure the test suite remains compatible with the latest container testing infrastructure.

Highlights

• Dependency Upgrade: Upgraded the testcontainers-go library to version v0.42.0 to resolve compatibility issues.
• Removal of Deprecated Package: Removed the github.com/docker/go-connections/nat dependency, which is no longer supported in the updated version.
• Code Refactoring: Updated integration test helper functions to use string-based port representations instead of the removed nat.Port type.

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[gemini-code-assist]

Code Review

This pull request updates several Go dependencies, including testcontainers-go to v0.42.0, and refactors integration tests to use string-based port definitions, removing the dependency on nat.Port. Feedback suggests using net.JoinHostPort in jdbc_test.go to properly handle IPv6 addresses when constructing database URLs.

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R: @lostluck for label go.

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