Version and CHANGELOG preparation

Author: carmocca

src/lightning_app/CHANGELOG.md

@@ -4,6 +4,12 @@ All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
+
+## [1.9.4] - 2023-02-28
+
+No changes.
+
+
 ## [1.9.3] - 2023-02-21
 
 ### Fixed

src/lightning_fabric/CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 
+## [1.9.4] - 2023-02-28
+
+No changes.
+
+
 ## [1.9.3] - 2023-02-21
 
 ### Fixed

src/pytorch_lightning/CHANGELOG.md

@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/).
 
 
+## [1.9.4] - 2023-02-28
+
+No changes.
+
+
 ## [1.9.3] - 2023-02-21
 
 ### Fixed

src/version.info

@@ -1 +1 @@
-1.9.3
+1.9.4