Migration to Kotlin 1.7.0

[nulls]

Move changes from #1358 and update tests

[codecov]

Codecov Report

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@@                   Coverage Diff                   @@
##             renovate/core-kotlin    #1362   +/-   ##
=======================================================
  Coverage                        ?   83.59%           
  Complexity                      ?     2567           
=======================================================
  Files                           ?      106           
  Lines                           ?     7291           
  Branches                        ?     2018           
=======================================================
  Hits                            ?     6095           
  Misses                          ?      353           
  Partials                        ?      843           

Flag	Coverage Δ
unittests	83.59% <0.00%> (?)

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