fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-1048302
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-2326698
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-2421244
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-3038424
- https://snyk.io/vuln/SNYK-JAVA-COMFASTERXMLJACKSONCORE-3038426

pom.xml

@@ -71,7 +71,7 @@
         <dependency>
             <groupId>io.jsonwebtoken</groupId>
             <artifactId>jjwt</artifactId>
-            <version>0.9.1</version>
+            <version>0.12.0</version>
         </dependency>
     </dependencies>