pinned sphinx and jinja dependencies

[larsbuntemeyer]

See pallets/jinja#1631

[codecov-commenter]

Codecov Report

Merging #45 (42d57a4) into master (887d8b9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #45   +/-   ##
=======================================
  Coverage   37.90%   37.90%           
=======================================
  Files          29       29           
  Lines        1311     1311           
=======================================
  Hits          497      497           
  Misses        814      814           

Flag	Coverage Δ
unittests	37.90% <ø> (ø)

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