Unit Tests: avoid hardcoding API version

[gcatanese]

This pull request updates several all service tests to reference the API version dynamically using the API_VERSION constant (from the relevant service).
This change ensures that the tests remain valid and maintainable when the API version changes, reducing the risk of hardcoded values becoming outdated.

[gemini-code-assist]

Summary of Changes

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This pull request enhances the robustness and maintainability of the Checkout API test suite by eliminating static API version references. By integrating dynamic version constants, the tests are now resilient to future API updates, ensuring their continued accuracy and reducing the overhead associated with version management.

Highlights

• Dynamic API Versioning in Tests: Replaced hardcoded API version 'v71' with dynamic PaymentsApi.API_VERSION or RecurringApi.API_VERSION constants in various test cases within CheckoutTest.java.
• Improved Test Maintainability: Ensured that tests automatically adapt to API version changes, reducing the need for manual updates and preventing outdated test failures.

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[gemini-code-assist]

Code Review

This pull request is a good improvement, replacing hardcoded API versions with a constant to improve maintainability. I've added a few suggestions to further enhance readability by using String.format for URL construction, which is a common practice for creating formatted strings and improves code clarity.