Bump jinja2 from 2.11.2 to 2.11.3 in /docs (#35)

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>

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

docs/requirements.txt

@@ -1,27 +1,27 @@
+-i https://pypi.org/simple/
 alabaster==0.7.12
-Babel==2.8.0
-certifi==2020.6.20
-chardet==3.0.4
+babel==2.9.0
+certifi==2020.12.5
+chardet==4.0.0
 commonmark==0.9.1
 docutils==0.16
-Flask-Sphinx-Themes==1.0.2
+flask-sphinx-themes==1.0.2
 idna==2.10
 imagesize==1.2.0
-Jinja2==2.11.2
-MarkupSafe==1.1.1
-packaging==20.4
-Pygments==2.6.1
+jinja2==2.11.3
+markupsafe==1.1.1
+packaging==20.9
+pygments==2.8.1
 pyparsing==2.4.7
-pytz==2020.1
+pytz==2021.1
 recommonmark==0.6.0
-requests==2.24.0
-six==1.15.0
-snowballstemmer==2.0.0
-Sphinx==3.2.1
+requests==2.25.1
+snowballstemmer==2.1.0
+sphinx==3.2.1
 sphinxcontrib-applehelp==1.0.2
 sphinxcontrib-devhelp==1.0.2
 sphinxcontrib-htmlhelp==1.0.3
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.4
-urllib3==1.25.10
+urllib3==1.26.4