PRIYA-34: Update pom.xml to Spring Boot 2.7.18 + Java 17

[devin-ai-integration]

Summary

Phase 1a of the Java migration effort. This PR makes exactly two version changes in pom.xml:

1. Spring Boot parent: 1.4.0.RELEASE → 2.7.18
2. java.version property: 1.8 → 17

No Java source files or dependencies were modified. mvn compile will fail after this change — this is expected and intentional. Compilation fixes (Spring Data JPA API changes, JUnit 4 → 5 migration, H2 2.x compatibility) will be addressed in Phase 1b.

Review & Testing Checklist for Human

• Verify 2.7.18 is the intended target Spring Boot version (it is the final 2.7.x patch release)
• Confirm no other files were modified beyond pom.xml — this should be a config-only change
• Ensure a Phase 1b ticket exists to address the known compilation errors (saveAll API change, JUnit annotations, H2 compatibility)

Notes

• This is a large version jump (1.4.x → 2.7.x, Java 8 → 17). The two-phase approach is deliberate: isolate the version bump from the code fixes for cleaner review.
• No meaningful end-to-end testing is possible at this phase since the project will not compile.

Link to Devin session: https://app.devin.ai/sessions/4351a7c1faec44849c6c13c2de471cfa
Requested by: @priya-cognition

[devin-ai-integration]

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[priya-cognition]

devin can you see this

[priya-cognition]

@devin-ai-integration test test

[devin-ai-integration]

Yes, I can see your comments! 👋

You mentioned earlier that the Spring Boot version is wrong. The current PR updates to 2.7.18 as specified in the PRIYA-34 ticket. Could you let me know what version it should be instead? Happy to update it.