Bump jinja2 from 2.11.3 to 3.1.2 in /src

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.3 to 3.1.2.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](pallets/jinja@2.11.3...3.1.2)

---
updated-dependencies:
- dependency-name: jinja2
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

src/Pipfile

@@ -35,7 +35,7 @@ cryptography = "==3.4.8"
 firebase-admin = "==2.16.0"
 Flask = "==1.1.2"
 itsdangerous = "==2.0.1"
-Jinja2 = "==2.11.3"
+Jinja2 = "==3.1.2"
 jira = "==2.0.0"
 markupsafe = "==2.0.1"
 PyJWT = "==2.3.0"