Bump detekt-gradle-plugin from 1.19.0 to 1.20.0

Bumps detekt-gradle-plugin from 1.19.0 to 1.20.0.

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

Signed-off-by: dependabot[bot] <support@github.com>

app/build.gradle

@@ -7,7 +7,7 @@ buildscript {
         classpath 'com.hiya:jacoco-android:0.2'
         classpath 'com.github.spotbugs.snom:spotbugs-gradle-plugin:5.0.6'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-        classpath "io.gitlab.arturbosch.detekt:detekt-gradle-plugin:1.19.0"
+        classpath "io.gitlab.arturbosch.detekt:detekt-gradle-plugin:1.20.0"
         classpath "commons-httpclient:commons-httpclient:3.1@jar" // remove after entire switch to lib v2
         classpath 'com.karumi:shot:5.13.0'
         classpath "org.jacoco:org.jacoco.core:$jacoco_version"