Update changelogs from fern repo (#3850)

Author: fern-support

fern/products/sdks/overview/php/changelog/2026-02-26.mdx

@@ -1,3 +1,9 @@
+## 2.1.4
+**`(fix):`** Fix PHP 8.5 deprecation warning for `ReflectionProperty::getDefaultValue()` called on
+properties without a default value. Now checks `hasDefaultValue()` before calling
+`getDefaultValue()` in `JsonSerializableType::jsonDeserialize()`.
+
+
 ## 2.1.3
 **`(chore):`** Use generator-cli JS API directly instead of subprocess spawning.
 Remove generator-cli from Docker image since it is now bundled via esbuild.