bpo-30380: Pin the version of Sphinx used to build the documentation …

bpo-30380: Pin the version of Sphinx used to build the documentation … · python/cpython@fca224f

Original file line number	Diff line number	Diff line change
`@@ -38,9 +38,11 @@ matrix:`
`38`	`38`	`- TESTING=docs`
`39`	`39`	`before_script:`
`40`	`40`	`- cd Doc`
`41`		`- - make venv`
	`41`	`+# Sphinx is pinned so that new versions that introduce new warnings won't suddenly cause build failures.`
	`42`	`+# (Updating the version is fine as long as no warnings are raised by doing so.)`
	`43`	`+ - python -m pip install sphinx~=1.6.1`
`42`	`44`	`script:`
`43`		`- - make check suspicious html PYTHON="./venv/bin/python" SPHINXBUILD="./venv/bin/python -m sphinx" SPHINXOPTS="-q -W"`
	`45`	`+ - make check suspicious html SPHINXOPTS="-q -W"`
`44`	`46`	`- os: linux`
`45`	`47`	`language: c`
`46`	`48`	`compiler: gcc`