chore(version): bump kmptoolkit.version to 3.5.31 (post-release)

[github-actions]

Auto-opened by mbl-actionhub-bump-version after a successful release of v3.5.30.

• Bump type: patch
• From: 3.5.30 (just published)
• To: 3.5.31 (next release target)
• File: gradle.properties → kmptoolkit.version=3.5.31

Sets the next sanity-check value so the next publish run can proceed (3.5.31 > 3.5.30 on Maven Central).

If you want a different bump type (minor/major) for the next cycle, close this PR and bump manually.

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