chore(deps): update kotlin.version to v1.8.20

pom.xml

@@ -20,7 +20,7 @@
     <properties>
         <flyway.version>7.15.0</flyway.version>
         <java.version>11</java.version>
-        <kotlin.version>1.7.20</kotlin.version>
+        <kotlin.version>1.8.20</kotlin.version>
         <commons-compress.version>1.21</commons-compress.version>
         <commons-text.version>1.10.0</commons-text.version>
         <hamcrest-date.version>2.0.8</hamcrest-date.version>