fix: fixing dependnecies and addressing vulnerabilities

[jkalandaibm]

PR summary

Fixes: https://github.com/IBM/networking-java-sdk/security/dependabot/4

Updated the vulnerable package, org.testng:testngto the latest, however it didn't play well with the jkd8 version.
Had to bump it up to 11, however other dependencies had to updated, which also included removing powermock dependencies from the test packages.

PR Checklist

Please make sure that your PR fulfills the following requirements:

• The commit message follows the Angular Commit Message Guidelines.
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• New tests
• Build/CI related changes
• Documentation content changes
• [x ] Other (please describe)

Vulnerable package need to be updated to the latest.

What is the current behavior?

Security alert

What is the new behavior?

Dependebot registered a vulnerability related to the org.testng:testng package.

Does this PR introduce a breaking change?

• Yes
• No

Other information

[jkalandaibm]

Based the changes of off this https://github.com/IBM/platform-services-java-sdk
in particular this PR IBM/platform-services-java-sdk@c394460

[MalarvizhiK]

🎉 This PR is included in version 0.32.1 🎉

The release is available on GitHub release

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