Backport of changelog: Add entry for AD secrets engine bug fix into release/1.11.x

[hc-github-team-secure-vault-core]

Backport

This PR is auto-generated from #16480 to be assessed for backporting due to the inclusion of the label backport/1.11.x.

The below text is copied from the body of the original PR.

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This PR adds a changelog entry for the fix that's addressed by the plugin version bump in #16140.

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Overview of commits

• 49290cd2c2e71682201cd7aaec198df8430a160f