Prepare for Spring Boot 2.7 migration: Update Maven plugins and Groovy/Spock

[callummiles]

Prepare for Spring Boot 2.7 migration: Update Maven plugins and Groovy/Spock

Summary

This PR implements the first three preparatory steps for the Spring Boot 2.7 migration:

Step 2 - Maven Plugin Updates:

• maven-surefire-plugin: 2.20 → 2.22.2
• maven-failsafe-plugin: 2.22.1 → 2.22.2
• jacoco-maven-plugin: 0.8.3 → 0.8.10

Step 3 - Groovy and Spock Updates:

• Added groovy.version property: 3.0.19
• Updated Groovy dependency to explicitly use ${groovy.version}
• spock-spring: 1.2-groovy-2.5 → 2.3-groovy-3.0
• spock-core: 1.2-groovy-2.5 → 2.3-groovy-3.0
• gmavenplus-plugin: 1.6.2 → 2.1.0

These updates prepare the build toolchain and test framework for Spring Boot 2.7 compatibility. The Spring Boot parent version remains at 2.2.0.M6 and will be updated in a subsequent PR.

Review & Testing Checklist for Human

⚠️ Important: Local testing was blocked by a Java version mismatch (Java 21 installed vs Java 11 required), so these changes rely on CI validation.

• Verify all 111 tests pass (89 unit + 22 integration tests) - CI should show green
• Check for Groovy 3.0 compatibility issues - The upgrade from Groovy 2.5 to 3.0 is a major version jump that could affect the 82 Groovy test files
• Verify application starts successfully - Run mvn spring-boot:run and confirm the app starts on port 8080 with H2 console accessible at /h2-console

Recommended Test Plan

1. Run mvn clean verify to execute the full test suite
2. Start the application with mvn spring-boot:run
3. Access http://localhost:8080/actuator/health and http://localhost:8080/h2-console to verify the app is running
4. Review any warnings or deprecation notices in the build output

Notes

• This PR only updates dependencies and build plugins in pom.xml - no application code changes
• These are preparatory steps; the actual Spring Boot version upgrade will come in a later PR
• The Groovy/Spock version jumps are significant (Groovy 2.5→3.0, Spock 1.2→2.3) so watch for compatibility issues

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Link to Devin run: https://app.devin.ai/sessions/af9436b432594e5895e81a22ce26ece5
Requested by: Callum Miles (@callummiles)

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