chore: Prepare v0.9.0 release (#594)

Author: ValerianRey

CHANGELOG.md

@@ -8,6 +8,8 @@ changelog does not include internal changes that do not affect the user.
 
 ## [Unreleased]
 
+## [0.9.0] - 2026-02-24
+
 ### Added
 
 - Added the function `torchjd.autojac.jac`. It's the same as `torchjd.autojac.backward` except that

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "setuptools.build_meta"
 
 [project]
 name = "torchjd"
-version = "0.8.1"
+version = "0.9.0"
 description = "Library for Jacobian Descent with PyTorch."
 readme = "README.md"
 authors = [