Bump Lightning Cloud to 0.5.7 (#14757)

* Bump Lightning Cloud to 0.5.7 🎉
* Fix link in changelog

Co-authored-by: Sherin Thomas <[email protected]>

Author: krshrimali

requirements/app/base.txt

@@ -1,4 +1,4 @@
-lightning-cloud==0.5.6
+lightning-cloud==0.5.7
 packaging
 deepdiff>=5.7.0, <=5.8.1
 starsessions>=1.2.1, <2.0 # strict

src/lightning_app/CHANGELOG.md

@@ -24,6 +24,8 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 ### Fixed
 
+- Making threadpool non default from LightningCloud client  ([#14757](https://github.com/Lightning-AI/lightning/pull/14757))
+
 - Resolved a bug where the state change detection using DeepDiff won't worked with Path, Drive objects ([#14465](https://github.com/Lightning-AI/lightning/pull/14465))
 
 - Resolved a bug where the wrong client was passed to collect cloud logs ([#14684](https://github.com/Lightning-AI/lightning/pull/14684))