Replace deprecated mockito-inline with mockito-core 5.18.0

[devin-ai-integration]

Summary

org.mockito:mockito-inline is deprecated — since Mockito 5 the inline mock maker is the default in mockito-core, so the separate artifact is unnecessary. This drops it and pins Mockito to 5.18.0.

+ext['mockito.version'] = '5.18.0'
+ext['byte-buddy.version'] = '1.17.6'
-testImplementation 'org.mockito:mockito-inline:4.0.0'
+testImplementation 'org.mockito:mockito-core'

Two non-obvious bits:

• The mockito.version property override is what actually matters: Spring Boot 2.6.3's dependency management pins Mockito to 4.0.0, so it also drags mockito-junit-jupiter (pulled in transitively by spring-boot-starter-test) to 4.0.0. Setting the property keeps mockito-core and mockito-junit-jupiter on the same 5.18.0 line instead of a 5.x/4.x split.
• Boot 2.6.3 manages byte-buddy at 1.11.22, which is too old for Mockito 5.18; byte-buddy.version is bumped to 1.17.6 to match what Mockito 5.18 expects.

No test source changes were needed — the suite only uses standard @MockBean/when/verify APIs, no removed Mockito 4 surface (initMocks, Matchers, verifyZeroInteractions) and no explicit MockMaker extension file that would need deleting.

Verification

./gradlew clean test spotlessCheck on Java 11 (the version CI uses): BUILD SUCCESSFUL, 68 tests, 0 failures.

Not addressed here (pre-existing on main, unrelated to this change):

• jacocoTestCoverageVerification fails at ~33% vs the 80% rule — CI runs test -x jacocoTestCoverageVerification.
• spotlessCheck crashes under JDK 17 (google-java-format needs --add-exports for jdk.compiler); it passes under Java 11.

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/6a8bfa10f81b4c6f82cebd2818c392fc
Requested by: @mbatchelor81

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✅ Devin Review: No Issues Found

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