fix: upgrade org.jetbrains.kotlin:kotlin-stdlib-jdk8 from 1.4.30 to 1.4.31

Snyk has created this PR to upgrade org.jetbrains.kotlin:kotlin-stdlib-jdk8 from 1.4.30 to 1.4.31.

See this package in Maven Repository:
https://mvnrepository.com/artifact/org.jetbrains.kotlin/kotlin-stdlib-jdk8/

See this project in Snyk:
https://app.snyk.io/org/flex-kmy/project/0c059ec9-d4a5-483f-bbec-a70a5f09076c?utm_source=github&utm_medium=upgrade-pr

Author: snyk-bot

flex-spring-proxy/pom.xml

@@ -19,7 +19,7 @@
     <properties>
         <start-class>no.nav.helse.flex.ApplicationKt</start-class>
         <java.version>14</java.version>
-        <kotlin.version>1.4.30</kotlin.version>
+        <kotlin.version>1.4.31</kotlin.version>
         <logstash-logback-encoder.version>4.11</logstash-logback-encoder.version>
     </properties>