🔖(hawthorn/1/bare) bump to hawthorn.1-3.3.1

Fixed

- Set `SESSION_COOKIE_SECURE` to True by default
- Fix build by installing py2neo 3.1.2 from its github repository
- Fix build after get-pip.py script moved location
- Fix pip install for python 2.7

releases/hawthorn/1/bare/CHANGELOG.md

@@ -9,6 +9,8 @@ release.
 
 ## [Unreleased]
 
+## [hawthorn.1-3.3.1] - 2021-09-28
+
 ### Fixed
 
 - Set `SESSION_COOKIE_SECURE` to True by default
@@ -252,7 +254,8 @@ result of updating our OpenEdX images from `ginkgo` to `hawthorn.1`. It is not
 functional and is intended for development and debugging work in
 [Arnold](https://github.com/openfun/arnold).
 
-[unreleased]: https://github.com/openfun/openedx-docker/compare/hawthorn.1-3.3.0...HEAD
+[unreleased]: https://github.com/openfun/openedx-docker/compare/hawthorn.1-3.3.1...HEAD
+[hawthorn.1-3.3.1]: https://github.com/openfun/openedx-docker/compare/hawthorn.1-3.3.0...hawthorn.1-3.3.1
 [hawthorn.1-3.3.0]: https://github.com/openfun/openedx-docker/compare/hawthorn.1-3.2.0...hawthorn.1-3.3.0
 [hawthorn.1-3.2.0]: https://github.com/openfun/openedx-docker/compare/hawthorn.1-3.1.1...hawthorn.1-3.2.0
 [hawthorn.1-3.1.1]: https://github.com/openfun/openedx-docker/compare/hawthorn.1-3.1.0...hawthorn.1-3.1.1