fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-3038424
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-3038426
- https://snyk.io/vuln/SNYK-JAVA-COMGOOGLEGUAVA-1015415
- https://snyk.io/vuln/SNYK-JAVA-COMGOOGLEGUAVA-5710356
- https://snyk.io/vuln/SNYK-JAVA-COMMONSCODEC-561518
- https://snyk.io/vuln/SNYK-JAVA-COMMONSIO-1277109
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEHTTPCOMPONENTS-1048058
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHEHTTPCOMPONENTS-31517
- https://snyk.io/vuln/SNYK-JAVA-ORGJETBRAINSKOTLIN-2393744
- https://snyk.io/vuln/SNYK-JAVA-ORGJSON-5488379
- https://snyk.io/vuln/SNYK-JAVA-ORGMOZILLA-1314295
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-2806360
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-3016888
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-3016889
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-3016891
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-3113851
- https://snyk.io/vuln/SNYK-JAVA-ORGYAML-3152153

pom.xml

@@ -17,7 +17,7 @@
         <maven.compiler.plugin>2.4</maven.compiler.plugin>
         <maven.shade.plugin>3.1.0</maven.shade.plugin>
         <dockerfile.maven.plugin>1.2.2</dockerfile.maven.plugin>
-        <javalin.version>4.5.0</javalin.version>
+        <javalin.version>5.0.0</javalin.version>
         <mockito.version>3.7.7</mockito.version>
         <junit.version>5.7.1</junit.version>
         <konghg.unirest>3.4.00</konghg.unirest>