upgrade docsify version to fix potential xss vulnerability

[nobodyiam]

What's the purpose of this PR

upgrade docsify version to fix potential xss vulnerability, see docsifyjs/docsify#2093

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• Read the Contributing Guide before making this pull request.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit tests to verify the code.
• Run mvn clean test to make sure this pull request doesn't break anything.
• Update the CHANGES log.

[codecov]

Codecov Report

Merging #4939 (340e04a) into master (d6bf360) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4939      +/-   ##
============================================
- Coverage     48.44%   48.41%   -0.04%     
+ Complexity     1727     1725       -2     
============================================
  Files           346      346              
  Lines         10836    10836              
  Branches       1080     1080              
============================================
- Hits           5250     5246       -4     
- Misses         5263     5265       +2     
- Partials        323      325       +2     

see 2 files with indirect coverage changes

[Anilople]

LGTM.

It works well on my machine.