adding pinned docutils per build output

 * https://github.com/maltfield/cross-platform-python-gui/runs/3277693152?check_suite_focus=true

2021-08-09T06:54:17.3791090Z + /usr/local/Cellar/python/3.7.8/bin/pip3 install --ignore-installed --upgrade --cache-dir build/deps/ --no-index --find-links file:///Users/runner/work/cross-platform-python-gui/cross-platform-python-gui/build/deps/ build/deps/Kivy-1.11.1-cp37-cp37m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl
2021-08-09T06:54:17.9022800Z Looking in links: file:///Users/runner/work/cross-platform-python-gui/cross-platform-python-gui/build/deps/
2021-08-09T06:54:17.9057790Z Processing ./build/deps/Kivy-1.11.1-cp37-cp37m-macosx_10_6_intel.macosx_10_9_intel.macosx_10_9_x86_64.macosx_10_10_intel.macosx_10_10_x86_64.whl
2021-08-09T06:54:20.7176550Z Processing ./build/deps/kivy-garden-0.1.4.tar.gz
2021-08-09T06:54:21.2291800Z ERROR: Could not find a version that satisfies the requirement docutils (from Kivy==1.11.1) (from versions: none)
2021-08-09T06:54:21.2944790Z ERROR: No matching distribution found for docutils (from Kivy==1.11.1)

Author: maltfield