deps: update dependency com.google.flogger:flogger-system-backend to v0.6

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.flogger:flogger-system-backend	0.5.1 -> 0.6

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[codecov]

Codecov Report

Merging #568 (fc520e5) into master (699a907) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #568   +/-   ##
=========================================
  Coverage     73.13%   73.13%           
- Complexity      877      878    +1     
=========================================
  Files           157      157           
  Lines          4542     4542           
  Branches        210      209    -1     
=========================================
  Hits           3322     3322           
  Misses         1100     1100           
  Partials        120      120           

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