Update base.txt

[keetonian]

Issue #, if available:
#922
Description of changes:
Update jsonschema version
Description of how you validated changes:

Checklist:

• Write/update tests
• make pr passes
• Update documentation

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #927 into develop will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #927   +/-   ##
========================================
  Coverage    94.66%   94.66%           
========================================
  Files           69       69           
  Lines         3018     3018           
  Branches       562      562           
========================================
  Hits          2857     2857           
  Misses          85       85           
  Partials        76       76

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[jlhood]

Thanks for fixing this!