[Security] Bump django from 2.2.6 to 2.2.8
[Security] Bump django from 2.2.6 to 2.2.8

Bumps [django](https://github.com/django/django) from 2.2.6 to 2.2.8. **This update includes a security fix.**
- [Release notes](https://github.com/django/django/releases)
- [Commits](https://github.com/django/django/compare/2.2.6...2.2.8)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
glogiotatidis/snippets-service,mozmar/snippets-service,mozmar/snippets-service,glogiotatidis/snippets-service,glogiotatidis/snippets-service,mozmar/snippets-service,mozmar/snippets-service,glogiotatidis/snippets-service