Update Kotlin core dependencies to v1.7.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.jetbrains.kotlin:kotlin-maven-plugin (source)	1.6.21 -> 1.7.0
org.jetbrains.kotlin:kotlin-compiler-embeddable (source)	1.6.21 -> 1.7.0
org.jetbrains.kotlin:kotlin-stdlib-common (source)	1.6.21 -> 1.7.0
org.jetbrains.kotlin:kotlin-stdlib-jdk8 (source)	1.6.21 -> 1.7.0
org.jetbrains.kotlin:kotlin-stdlib (source)	1.6.21 -> 1.7.0
org.jetbrains.kotlin:kotlin-maven-serialization (source)	1.6.21 -> 1.7.0

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[codecov]

Codecov Report

Merging #1357 (9dd639b) into master (14bbc94) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master    #1357   +/-   ##
=========================================
  Coverage     83.59%   83.59%           
  Complexity     2567     2567           
=========================================
  Files           106      106           
  Lines          7291     7291           
  Branches       2018     2018           
=========================================
  Hits           6095     6095           
  Misses          353      353           
  Partials        843      843           

Flag	Coverage Δ
unittests	83.59% <ø> (ø)

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