[Release Notes] LKE 1.57 (#6770)

* LKE 1.57 release notes

* copy edit

docs/release-notes/lke/v1.57.0.md

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+---
+title: Linode Kubernetes Engine v1.57.0
+date: 2023-12-14
+version: 1.57.0
+---
+
+### Changed
+
+- Upgraded clusters using Kubernetes 1.27 to patch version 1.27.8
+
+### Added
+
+- Kubernetes 1.28 is now available on LKE. Review the Kubernetes [changelog](https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.28.md).
+- The node-mask-cidr size changed from /24 to /25. This has no impact on the max pods per node (110).