Update Changelog for 1.4.0 release

Author: jluethi

CHANGELOG.md

@@ -1,10 +1,10 @@
 **Note**: Numbers like (\#123) point to closed Pull Requests on the fractal-tasks-core repository.
 
 
-# Unreleased
+# 1.4.0
 
 * Tasks:
-    * Refactor projection task to use ngio
+    * Refactor projection task to use ngio (\#866).
 * Dependencies:
     * Add `ngio==0.1.4` to the dependencies
     * Require `python >=3.10,<3.13`
@@ -21,7 +21,6 @@
     * Support providing `docs_info=file:task_info/description.md` (\#876).
     * Deprecate `check_manifest.py` module, in favor of additional GitHub action steps (\#876).
 
-
 # 1.3.3
 
 * Add new metadata (authors, category, modality, tags) to manifest models and to tasks (\#855).