chore(main): release 9.15.0

[github-actions]

🤖 I have created a release beep boop

9.15.0 (2026-02-10)

Features

• Drop support for python 3.9 (#393) (5b761bd)
• Update ChangeSet to always require a Selector (#405) (5dc4f81)

Bug Fixes

• Add context manager for clearer, safer locks (#396) (beca0fa)
• Address potential race condition in FeatureStore update_availability (#391) (31cf487)
• Allow modifying fdv2 data source options independent of main config (#403) (d78079e)
• Mark copy_with_new_sdk_key method as deprecated (#353) (e471ccc)
• Prevent immediate polling on recoverable error (#399) (da565a2)
• Redis store is considered initialized when $inited key is written (e99a27d)
• Stop FeatureStoreClientWrapper poller on close (#397) (468afdf)
• Update DataSystemConfig to accept list of synchronizers (#404) (c73ad14)
• Update reason documentation with inExperiment value (#401) (cbfc3dd)
• Update Redis to write missing $inited key (e99a27d)

---

This PR was generated with Release Please. See documentation.

---

Note

Low Risk
Release-only changes (version strings and documentation) with no functional code modifications in this diff.

Overview
Bumps the SDK release from 9.14.1 to 9.15.0 across version sources (pyproject.toml, ldclient/version.py, release-please manifest) and updates PROVENANCE.md to reference the new version.

Updates CHANGELOG.md with the 9.15.0 release notes, including FDv2 EAP breaking API adjustments (e.g., ChangeSetBuilder.finish() now requires a Selector, and DataSystemConfig.synchronizers supports multiple synchronizers), Python 3.9 support drop, and a set of bug-fix entries.

^{Written by Cursor Bugbot for commit 71a9224. This will update automatically on new commits. Configure here.}

[github-actions]

🤖 Created releases:

• 9.15.0

🌻