fix: trim 0.5.3 CHANGELOG entry to PR-scoped summary

Author: claude

CHANGELOG.md

@@ -2,13 +2,8 @@
 
 ## 0.5.3
 
-- Bumped `Version::API_SPEC_VERSION` to the Apify OpenAPI spec `v2-2026-08-27T071624Z`. Covers the
-  removal of `pricingInfos` from the Create Actor request body (never implemented by this client),
-  the `RequestWithoutId`/`RequestBase` bundling fix (this client already enforces the `uniqueKey`/
-  `url` requirement client-side), and additive error-response/enum/format documentation fixes
-  (nullable `notice`, unformatted `pictureUrl`, `401` on `GET /v2/users/{userId}`, a new `ErrorType`
-  member, `409` on `PUT /v2/schedules/{scheduleId}`). None of this client's typed models expose
-  those fields or enums, so no client code or public interface change.
+- Bumped `Version::API_SPEC_VERSION` to the Apify OpenAPI spec `v2-2026-08-27T071624Z`.
+- Bumped `Version::CLIENT_VERSION` to `0.5.3`.
 
 ## 0.5.2