Bump jinja2 from 2.11.2 to 2.11.3 in /src/api

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)

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

Author: dependabot[bot]

src/api/requirements.txt

@@ -8,7 +8,7 @@ ete3==3.1.1
 Flask==1.1.2
 idna==2.7
 itsdangerous==1.1.0
-Jinja2==2.11.2
+Jinja2==2.11.3
 macholib==1.14
 MarkupSafe==1.1.1
 PyInstaller==3.6