Bump decorator from 4.3.2 to 4.4.0

Bumps [decorator](https://github.com/micheles/decorator) from 4.3.2 to 4.4.0.
- [Release notes](https://github.com/micheles/decorator/releases)
- [Changelog](https://github.com/micheles/decorator/blob/master/CHANGES.md)
- [Commits](https://github.com/micheles/decorator/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -12,7 +12,7 @@ httplib2<=0.10.3
 urllib3==1.24.2
 Paver==1.3.4
 python-slugify==3.0.2
-decorator==4.3.2
+decorator==4.4.0
 celery==4.2.1
 kombu==4.6.3
 boto<=2.49.0