Upgrade rest-assured 4.5.1 -> 5.4.0

[devin-ai-integration]

Summary

Bumps the four io.rest-assured test dependencies (rest-assured, json-path, xml-path, spring-mock-mvc) from 4.5.1 to 5.4.0.

No test source changes were required: the io.restassured.* package names and the RestAssuredMockMvc.given()/when()/mockMvc() APIs used across the 8 src/test/java/io/spring/api/*ApiTest.java classes are unchanged between 4.5 and 5.4.

The notable transitive effect is the Groovy runtime swap — 5.x moves off Codehaus Groovy 3 to Apache Groovy 4:

- org.codehaus.groovy:groovy(-json,-xml):3.0.x   (Boot 2.6.3 BOM managed)
+ org.apache.groovy:groovy(-json,-xml):4.0.16    (pulled by rest-assured 5.4.0)

Different groupId, so no version conflict with the Spring Boot 2.6.3 BOM; dependencyInsight --configuration testRuntimeClasspath confirms 5.4.0 wins over the DGS platform's prefer 3.3.0 constraint.

Also refreshed the rest-assured row in the repo skill's dependency baseline table.

Verification

JAVA_HOME=<jdk11> ./gradlew clean test spotlessCheck -x jacocoTestCoverageVerification — BUILD SUCCESSFUL, 68 tests, 0 failures/errors/skips.

jacocoTestCoverageVerification fails at 0.33 vs the 0.80 minimum, but this reproduces identically on main before this change (it is why the environment's test command excludes it).

Link to Devin session: https://partner-workshops.devinenterprise.com/sessions/f8ff20c85a4f476cb8c4591a254abd16
Requested by: @mbatchelor81

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[devin-ai-integration]

✅ Devin Review: No Issues Found

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