Bump sphinx-inline-tabs to support Sphinx's -j

Author: webknjaz

requirements.txt

@@ -1,5 +1,5 @@
 sphinx==3.2.0
 sphinx-autobuild==0.7.1
-sphinx-inline-tabs==2020.10.19b4
+sphinx-inline-tabs==2021.3.19b5
 git+https://github.com/python/python-docs-theme.git#egg=python-docs-theme
 git+https://github.com/pypa/pypa-docs-theme.git#egg=pypa-docs-theme