Bump kotlinpoet from 1.8.0 to 1.9.0

Bumps [kotlinpoet](https://github.com/square/kotlinpoet) from 1.8.0 to 1.9.0.
- [Release notes](https://github.com/square/kotlinpoet/releases)
- [Changelog](https://github.com/square/kotlinpoet/blob/master/docs/changelog.md)
- [Commits](square/kotlinpoet@1.8.0...1.9.0)

---
updated-dependencies:
- dependency-name: com.squareup:kotlinpoet
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

core/build.gradle

@@ -20,7 +20,7 @@ dependencies {
     kapt "com.google.auto.service:auto-service:1.0-rc7"
 
 
-    testImplementation 'com.squareup:kotlinpoet:1.8.0'
+    testImplementation 'com.squareup:kotlinpoet:1.9.0'
     testImplementation 'com.squareup:javapoet:1.13.0'
 
     implementation "com.squareup.okio:okio:2.10.0"