Bump jinja2 from 2.10.3 to 2.11.3

Bumps [jinja2](https://github.com/pallets/jinja) from 2.10.3 to 2.11.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](pallets/jinja@2.10.3...2.11.3)

---
updated-dependencies:
- dependency-name: jinja2
  dependency-type: direct:production
...

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

requirements.txt

@@ -4,7 +4,7 @@ Flask==1.1.1
 Flask-Bootstrap==3.3.7.1
 gunicorn==20.0.4
 itsdangerous==1.1.0
-Jinja2==2.10.3
+Jinja2==2.11.3
 joblib==0.14.1
 MarkupSafe==1.1.1
 numpy==1.18.1