Add CHANGELOG entry for v1.47.0

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Relates #0000

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the library.

Changes to Security Controls

No changes to security controls.

Description

This PR adds a changelog entry for the next minor version v1.47.0 following the release of v1.46.0.

Changes

• Added changelog section for v1.47.0 (Unreleased)