Bump jinja2 in /{{cookiecutter.project_slug}}/backend (#155)

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.2 to 2.11.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/master/CHANGES.rst)
- [Commits](pallets/jinja@2.11.2...2.11.3)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

{{cookiecutter.project_slug}}/backend/requirements.txt

@@ -6,7 +6,7 @@ redis==3.5.3
 httpx==0.15.5
 ipython==7.18.1
 itsdangerous==1.1.0
-Jinja2==2.11.2
+Jinja2==2.11.3
 psycopg2==2.8.6
 pytest==6.1.0
 requests==2.24.0