Update test suite for Java 17 compatibility

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Summary

Replaces double-brace initialization (new HashMap<>() {{ put(...); }}) with Map.of() across 5 API test files as part of a Java 17 compatibility review of the full test suite (23 files).

Double-brace initialization creates anonymous inner subclasses of HashMap, which can cause issues under Java 17's stronger encapsulation (serialization edge cases, unnecessary class generation). Map.of() is cleaner and available since Java 9 (project targets Java 11+).

Files changed: ArticleApiTest, ArticlesApiTest, CommentsApiTest, CurrentUserApiTest, UsersApiTest

Other 18 test files reviewed — no issues found:

• No reflection-based test utilities (setAccessible, getDeclaredField, etc.)
• No deprecated JUnit 4 APIs — all tests already use JUnit Jupiter
• No @SuppressWarnings for deprecated APIs
• Mockito 4.0.0 (managed by Spring Boot 2.6.3) meets the minimum version for Java 17

Build note (not addressed here — out of scope): The Spotless plugin (Google Java Format) fails on Java 17 and the Mockito/ByteBuddy versions (4.0.0 / 1.11.22) may need --add-opens JVM args in build.gradle. These are build config issues to be handled separately.

Review & Testing Checklist for Human

• Verify that Map.of() returning unmodifiable maps doesn't break RestAssured's .body() JSON serialization — the maps are only serialized, never mutated after creation, but worth a quick sanity check
• Confirm no test parameter can be null — Map.of() throws NullPointerException on null keys/values, unlike HashMap.put()

Notes

• All tests compile and pass on Java 17 (ran ./gradlew test -x spotlessJava successfully)
• Net result: +16 lines / −131 lines — pure simplification with no behavioral change

Link to Devin session: https://app.devin.ai/sessions/906b3faf646a4e6b93024afe126b976b
Requested by: @shayanshafii

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✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.