fix: pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-CHQOSLOGBACK-6094942
- https://snyk.io/vuln/SNYK-JAVA-CHQOSLOGBACK-6094943
- https://snyk.io/vuln/SNYK-JAVA-CHQOSLOGBACK-6097492
- https://snyk.io/vuln/SNYK-JAVA-CHQOSLOGBACK-6097493
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHECOMMONS-5901530
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHETOMCATEMBED-5953331
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHETOMCATEMBED-5959654
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHETOMCATEMBED-5959972
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHETOMCATEMBED-6092281
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHETOMCATEMBED-6435948
- https://snyk.io/vuln/SNYK-JAVA-ORGAPACHETOMCATEMBED-6435950

pom.xml

@@ -61,7 +61,7 @@
         <dependency>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-javadoc-plugin</artifactId>
-            <version>3.6.2</version>
+            <version>3.6.3</version>
         </dependency>
 
         <dependency>