Set jazzy version to 0.9.1

[helenmasters]

Description

Set jazzy version to 0.9.1

Motivation and Context

Workaround to allow jazzy doc to build for IBM-Swift\HeliumLogger which fails on jazzy 0.9.2 and later with realm/jazzy#972

How Has This Been Tested?

This command has been tested locally on the command line.

Checklist:

• I have submitted a CLA form
• If applicable, I have updated the documentation accordingly.
• If applicable, I have added tests to cover my changes.

[codecov-io]

Codecov Report

Merging #134 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #134   +/-   ##
=====================================
  Coverage      50%    50%           
=====================================
  Files           1      1           
  Lines          10      8    -2     
=====================================
- Hits            5      4    -1     
+ Misses          5      4    -1

Impacted Files	Coverage Δ
Tests/libraryTests/libraryTests.swift	50% <0%> (ø)	⬆️

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