Bump io.gitlab.arturbosch.detekt from 1.20.0 to 1.21.0

Bumps [io.gitlab.arturbosch.detekt](https://github.com/detekt/detekt) from 1.20.0 to 1.21.0.
- [Release notes](https://github.com/detekt/detekt/releases)
- [Commits](detekt/detekt@v1.20.0...v1.21.0)

---
updated-dependencies:
- dependency-name: io.gitlab.arturbosch.detekt
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -3,7 +3,7 @@ plugins {
     id 'org.jetbrains.kotlin.plugin.serialization' version '1.6.21'
     id 'org.jetbrains.kotlinx.kover' version '0.5.1'
     id "org.jlleitschuh.gradle.ktlint" version "10.3.0"
-    id "io.gitlab.arturbosch.detekt" version "1.20.0"
+    id "io.gitlab.arturbosch.detekt" version "1.21.0"
 }
 
 group 'de.plastickarma.kotlinx.serialization.format.ion'