chore: release 0.31.0

Signed-off-by: Louis Hulot <louis.hulot@owkin.com>

Author: Louis Hulot

CHANGELOG.md

@@ -7,7 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## \[Unreleased\]
 
-## [0.31.0](https://github.com/Substra/substrafl/releases/tag/0.31.0) - 2022-09-26
+## [0.31.0](https://github.com/Substra/substrafl/releases/tag/0.31.0) - 2022-10-03
 
 ### Removed