Bump jinja2 from 2.11.3 to 3.1.3

Bumps [jinja2](https://github.com/pallets/jinja) from 2.11.3 to 3.1.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/main/CHANGES.rst)
- [Commits](pallets/jinja@2.11.3...3.1.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,7 +1,7 @@
 cython==0.29.21
 scons==4.0.1
 six==1.15.0
-jinja2==2.11.3
+jinja2==3.1.3
 sympy==1.7.1
 scikit-learn==0.24.0
 cffi==1.14.4