Update the migration guide for Helidon 4.x to include the maven coordinate changes for the various media artifacts

[rlubke]

For example in Helidon 3.x, the following artifacts were available:

      <groupId>io.helidon.media</groupId>
      <artifactId>helidon-media-jsonb</artifactId>
    
      <groupId>io.helidon.media</groupId>
      <artifactId>helidon-media-jsonp</artifactId>

were moved to in 4.x:

      <groupId>io.helidon.http.media</groupId>
      <artifactId>helidon-http-media-jsonb</artifactId>

      <groupId>io.helidon.http.media</groupId>
      <artifactId>helidon-http-media-jsonp</artifactId>

Environment Details

• Helidon Version: 4.1.3
• Helidon MP
• JDK version: java version "21.0.5" 2024-10-15 LTS
• OS: MacOS 14.7.1 (apple silicon)

[tvallin]

The dependencies you mentioned are for Helidon SE, but the issue is reported against Helidon MP. Did you mean SE ?