Make branch v5.3.x compile with JDK21 and Maven 3.9.12

[gspadotto]

Purpose

Remove layers of historic dependencies and make the v5.3.x branch compile with modern JDKs and Maven versions

Goals

Compile with JDK 21
Remove as many warnings from the Maven build
Use plugin annotations rather than javadocs

Approach

User stories

Release note

Documentation

Training

Certification

Marketing

Automation tests

Security checks

Samples

Related PRs

Replaces PR#118

Migrations (if applicable)

Test environment

Maven home: /usr/local/apache-maven-3.9.12
Java version: 21.0.2, vendor: Eclipse Adoptium, runtime: /Library/Java/JavaVirtualMachines/temurin-21.jdk/Contents/Home
Default locale: en_IT, platform encoding: UTF-8
OS name: "mac os x", version: "15.7.3", arch: "x86_64", family: "mac"

Learning

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