Update dependency com.google.guava:guava to v30.1.1-jre

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.guava:guava	30.0-jre -> 30.1.1-jre

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[codecov]

Codecov Report

Merging #18 (9ee9199) into main (e52633e) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main      #18   +/-   ##
=========================================
  Coverage     65.55%   65.55%           
  Complexity      189      189           
=========================================
  Files            40       40           
  Lines           778      778           
  Branches         50       50           
=========================================
  Hits            510      510           
  Misses          227      227           
  Partials         41       41           

Flag	Coverage Δ
unittests	65.55% <ø> (ø)

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