Bump Kotlin to 2.2.20 from 1.9.25 so we can run tests with Java 25

Signed-off-by: David Frizelle <david.frizelle@gmail.com>

Author: dafriz

pom.xml

@@ -274,7 +274,7 @@
 <azure-open-ai-client.version>1.0.0-beta.16</azure-open-ai-client.version>
 <jtokkit.version>1.1.0</jtokkit.version>
 <victools.version>4.37.0</victools.version>
-<kotlin.version>1.9.25</kotlin.version>
+<kotlin.version>2.2.20</kotlin.version>
 
 <!-- NOTE: keep bedrockruntime and awssdk versions aligned -->
 <bedrockruntime.version>2.31.65</bedrockruntime.version>