Bump com.diffplug.spotless:spotless-plugin-gradle from 6.19.0 to 6.20…

….0 (#1374)

Bumps [com.diffplug.spotless:spotless-plugin-gradle](https://github.com/diffplug/spotless) from 6.19.0 to 6.20.0.
- [Changelog](https://github.com/diffplug/spotless/blob/main/CHANGES.md)
- [Commits](diffplug/spotless@gradle/6.19.0...gradle/6.20.0)

---
updated-dependencies:
- dependency-name: com.diffplug.spotless:spotless-plugin-gradle
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

buildSrc/build.gradle.kts

@@ -40,7 +40,7 @@ repositories {
 dependencies {
   implementation(gradleApi())
 
-  implementation("com.diffplug.spotless:spotless-plugin-gradle:6.19.0")
+  implementation("com.diffplug.spotless:spotless-plugin-gradle:6.20.0")
   implementation("io.opentelemetry.instrumentation:gradle-plugins:1.29.0-alpha-SNAPSHOT")
 
   // keep these versions in sync with settings.gradle.kts