PR Summary

Low Risk
Version and changelog-only release PR with no runtime code changes in this diff.

Overview
Release 3.1.4 bumps the published package version from 3.1.3 to 3.1.4 in package.json and VERSION, and updates CHANGELOG.md accordingly.

The new [3.1.4] - 2026-06-05 section documents the shipped change from #336: the Java MPCommerceEventActionType enum is now base-1 (indexing fix on Android). Compare links at the bottom of the changelog now point Unreleased at 3.1.4...HEAD and add a 3.1.3...3.1.4 release link.

Unreleased notes (Expo pinningDisabled, iOS sample CI pins) stay under [Unreleased] and are not part of this tag.

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