Add comment to POM regarding jjwt exclusion and Jackson 3 support (#424)

Author: Copilot

xapi-client/pom.xml

@@ -17,6 +17,8 @@
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-webflux</artifactId>
       <exclusions>
+        <!-- jjwt does not currently support Jackson 3. This exclusion should be
+          removed once jjwt adds Jackson 3 support. -->
         <exclusion>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-jackson</artifactId>

xapi-model-spring-boot-starter/pom.xml

@@ -15,6 +15,8 @@
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-web</artifactId>
       <exclusions>
+        <!-- jjwt does not currently support Jackson 3. This exclusion should be
+          removed once jjwt adds Jackson 3 support. -->
         <exclusion>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-starter-jackson</artifactId>