Bump kotlin from 2.0.20 to 2.0.21 in /examples/kotlin-*

Bumps [org.jetbrains.kotlin:kotlin-bom](https://github.com/JetBrains/kotlin) from 2.0.20 to 2.0.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.0.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

examples/kotlin-gradle-wrapper/build.gradle.kts

@@ -3,7 +3,7 @@ import com.adarshr.gradle.testlogger.TestLoggerPlugin
 import com.adarshr.gradle.testlogger.theme.ThemeType
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("com.adarshr.test-logger") version "4.0.0"
 }
 

examples/kotlin-gradle/build.gradle.kts

@@ -3,7 +3,7 @@ import com.adarshr.gradle.testlogger.TestLoggerPlugin
 import com.adarshr.gradle.testlogger.theme.ThemeType
 
 plugins {
-    kotlin("jvm") version "2.0.20"
+    kotlin("jvm") version "2.0.21"
     id("com.adarshr.test-logger") version "4.0.0"
 }
 

examples/kotlin-maven-wrapper/pom.xml

@@ -18,7 +18,7 @@
             <dependency>
                 <groupId>org.jetbrains.kotlin</groupId>
                 <artifactId>kotlin-bom</artifactId>
-                <version>2.0.20</version>
+                <version>2.0.21</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
@@ -46,7 +46,7 @@
             <plugin>
                 <groupId>org.jetbrains.kotlin</groupId>
                 <artifactId>kotlin-maven-plugin</artifactId>
-                <version>2.0.20</version>
+                <version>2.0.21</version>
 
                 <executions>
                     <execution>

examples/kotlin-maven/pom.xml

@@ -18,7 +18,7 @@
             <dependency>
                 <groupId>org.jetbrains.kotlin</groupId>
                 <artifactId>kotlin-bom</artifactId>
-                <version>2.0.20</version>
+                <version>2.0.21</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
@@ -46,7 +46,7 @@
             <plugin>
                 <groupId>org.jetbrains.kotlin</groupId>
                 <artifactId>kotlin-maven-plugin</artifactId>
-                <version>2.0.20</version>
+                <version>2.0.21</version>
 
                 <executions>
                     <execution>