Bump kotlin_version from 1.9.21 to 1.9.23

Bumps `kotlin_version` from 1.9.21 to 1.9.23.

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 1.9.21 to 1.9.23
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.9.23/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.21...v1.9.23)

Updates `org.jetbrains.kotlin:kotlin-stdlib-jdk7` from 1.9.21 to 1.9.23
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.9.23/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.21...v1.9.23)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib-jdk7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.9.21'
+    ext.kotlin_version = '1.9.23'
     repositories {
         google()
         mavenCentral()