Update sphinx-tabs from 1.1.11 to 1.1.12

Author: pyup-bot

requirements/local-docs-build.txt

@@ -11,7 +11,7 @@
 docutils==0.14  # pyup: ignore
 
 sphinx_rtd_theme==0.4.3
-sphinx-tabs==1.1.11
+sphinx-tabs==1.1.12
 # Required to avoid Transifex error with reserved slug
 # https://github.com/sphinx-doc/sphinx-intl/pull/27
 git+https://github.com/agjohnson/sphinx-intl.git@7b5c66bdb30f872b3b1286e371f569c8dcb66de5#egg=sphinx-intl