[Draft] Upgrade JDK target to 17

[Andyz26]

Context

Upgrade project to target JDK17.

Checklist

• ./gradlew build compiles code correctly
• Added new tests where applicable
• ./gradlew test passes all tests
• Extended README or added javadocs where applicable

[Andyz26]

@crioux-stripe @kmg-stripe @garryliu-stripe How do you feel about the moving towards jdk17 for the OSS components? Any thing internal you need to keep on jdk8? This is still early draft and I have some internal validation to do but I would like to see how you folks feel about this early.

[github-actions]

Test Results

142 files  ±0  142 suites  ±0   8m 1s ⏱️ -27s
619 tests ±0  608 ✅ ±0  11 💤 +1  0 ❌  - 1 
619 runs   - 1  608 ✅  - 1  11 💤 +1  0 ❌  - 1 

Results for commit 1909c32. ± Comparison against base commit 35a0826.

This pull request skips 1 test.

io.mantisrx.publish.internal.discovery.MantisJobDiscoveryTest ‑ testJobDiscoveryFetchFailureHandlingAfterSuccess()

♻️ This comment has been updated with latest results.

[github-actions]

Uploaded Artifacts

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[crioux-stripe]

@Andyz26 I think we'd be pretty keen to move to JDK 17! We're running 11 on the Mantis hosts right now but most of our Java monorepo is 17+. I don't think anything is preventing us from running 17, and we may have prototyped with it IIRC.