v4.0.0-M1

⭐ New features

• Update baseline to Spring Framework 7 and Spring Boot 4
• Update test infrastructure to JUnit 6

🆙 Dependency updates

• Commons IO: 2.20.0
• jLine: 3.30.6
• st4: 4.3.4

📘 Documentation updates

• Update Antora resources
• Refine reference documentation: e3cb937
• Attach Javadocs to Antora

🛠️ Tasks

• Update build tool to Maven
• Update release process to use Spring IO GitHub Actions