Bump version, update changelog for Envisage 7.0.4 (#586)

This PR bumps the package version and updates the changelog in
preparation for a 7.0.4 bugfix release.

@flongford Would you have bandwidth to review?

Author: mdickinson

CHANGES.rst

@@ -2,6 +2,38 @@
  Release history
 =================
 
+Version 7.0.4
+=============
+
+Release: 2025-04-25
+
+This is a bugfix release.
+
+Fixes
+-----
+* Fix a situation where preferences were incorrectly written by
+  the ``PreferencesPane`` before changes were approved. (#583)
+* Add a name attribute to the ``EventManagerPlugin``. (#571)
+
+Build
+-----
+* Update copyright header end years for 2024, 2025. (#572, #589)
+* Add dependendabot config for GitHub Actions; bump individual
+  actions to their latest versions. (#573, #575, #576, #577, #579, #581, #588)
+* Remove Slack notifications, which were using an outdated
+  and unmaintained GitHub Action. (#580)
+* Require apptools 5.3 or later and Python 3.8 or later. (#584)
+* Update black to version 24.3.0 to address a ReDoS
+  vulnerability in earlier versions. (#585)
+
+Tests
+-----
+* Remove skip decorator on some PySide6-related tests. (#587)
+
+Documentation
+-------------
+* Remove the ``sphinx.ext.githubpages`` extension. (#566)
+
 Version 7.0.3
 =============
 

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = 'setuptools.build_meta'
 
 [project]
 name = 'envisage'
-version = '7.0.3'
+version = '7.0.4'
 description = 'Extensible application framework'
 readme = 'README.rst'
 requires-python = '>= 3.8'