[docs] Port changelog for release 25.10.2

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Note: This PR was automatically generated by the openwisp-utils releaser tool.

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📝 Walkthrough

Walkthrough

This change adds a new Version 25.10.2 entry to the project's changelog (CHANGES.md). The entry documents two bugfixes: pinning the drf-yasg dependency to version 1.21.11 as a workaround for an unspecified issue, and fixing a duplicated conflicting Referrer-Policy header. No other sections or prior version entries are modified.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

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Reviewing files that changed from the base of the PR and between 5abe3d4 and 129aa19.

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• CHANGES.md

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