Bump klaxon from 5.3 to 5.4

Bumps [klaxon](https://github.com/cbeust/klaxon) from 5.3 to 5.4.
- [Release notes](https://github.com/cbeust/klaxon/releases)
- [Changelog](https://github.com/cbeust/klaxon/blob/master/RELEASE_NOTES.txt)
- [Commits](https://github.com/cbeust/klaxon/commits/5.4)

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

Author: dependabot[bot]

kotlin-spark-api/pom.xml

@@ -65,7 +65,7 @@
         <dependency>
             <groupId>com.beust</groupId>
             <artifactId>klaxon</artifactId>
-            <version>5.3</version>
+            <version>5.4</version>
             <scope>test</scope>
         </dependency>
         <dependency>