Fix SNYK-JAVA-ORGAPACHETOMCATEMBED-15307822: upgrade tomcat-embed-core to 11.0.18

Override tomcat.version property to resolve Incorrect Authorization
vulnerability in tomcat-embed-core 11.0.15 (transitive via
spring-boot-starter-tomcat).

Co-authored-by: Ona <no-reply@ona.com>

Author: meysholdt

pom.xml

@@ -31,6 +31,7 @@
     <maven-checkstyle.version>3.6.0</maven-checkstyle.version>
     <nohttp-checkstyle.version>0.0.11</nohttp-checkstyle.version>
     <spring-format.version>0.0.47</spring-format.version>
+    <tomcat.version>11.0.18</tomcat.version>
   </properties>
 
   <licenses>