Update changelogs from fern repo (#5215)

Co-authored-by: dsinghvi <10870189+dsinghvi@users.noreply.github.com>

Author: fern-support

fern/products/sdks/generators/java/changelog/2026-04-28.mdx

@@ -0,0 +1,10 @@
+## 4.6.2
+**`(fix):`** Fix Java SDK generation crash when an OpenAPI property name is a Java keyword
+or literal (e.g. `true`, `false`, `null`, `if`, `new`). `KeyWordUtils` only
+sanitized 12 of Java's reserved words, so JavaPoet rejected the rest with
+`IllegalArgumentException: not a valid name`. The reserved-word set now covers
+the full Java keyword list plus `true`/`false`/`null` literals, so these
+properties generate as `_<name>` fields with `@JsonProperty("<name>")`
+preserving the wire format.
+
+