Bump jinja2 from 2.10.1 to 2.11.3 in /test/loadtest (#1456)

Bumps [jinja2](https://github.com/pallets/jinja) from 2.10.1 to 2.11.3.
- [Release notes](https://github.com/pallets/jinja/releases)
- [Changelog](https://github.com/pallets/jinja/blob/master/CHANGES.rst)
- [Commits](https://github.com/pallets/jinja/compare/2.10.1...2.11.3)

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

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

test/loadtest/requirements.txt

@@ -6,7 +6,7 @@ gevent==1.4.0
 greenlet==0.4.15
 idna==2.8
 itsdangerous==1.1.0
-Jinja2==2.10.1
+Jinja2==2.11.3
 locustio==0.11.0
 MarkupSafe==1.1.1
 msgpack==0.6.1