[Snyk] Upgrade io.reactivex.rxjava2:rxjava from 2.2.12 to 2.2.21

[snyk-bot]

Snyk has created this PR to upgrade io.reactivex.rxjava2:rxjava from 2.2.12 to 2.2.21.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 9 versions ahead of your current version.
• The recommended version was released a year ago, on 2021-02-13.

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[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov[bot]]

Codecov Report

Merging #136 (aa3762b) into master (d4aa7ff) will not change coverage. The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #136   +/-   ##
=========================================
  Coverage     85.61%   85.61%           
  Complexity       54       54           
=========================================
  Files             5        5           
  Lines           146      146           
  Branches          1        1           
=========================================
  Hits            125      125           
  Misses           19       19           
  Partials          2        2           

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