update changelogs

Author: fern-support

fern/products/sdks/overview/python/changelog/2025-08-27.mdx

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+## 4.27.0-rc0
+**`(feat):`** Client imports are now lazy loaded by default. This will greatly reduce memory footprint when using a small portion of a large API.
+The tradeoff is a latency penalty when first accessing a client.
+Users can opt in to eager loading (the old behavior) by setting the `lazy_imports` flag to `false` in their configuration.
+
+