Jdk bump

[gberche-orange]

• bump attempt to java11 in maven, failed stuck with
  • springboot issue likely requiring interactive debugging
  • intellij issues preventing building & running debugger
• additionnally the use of the java11 within intellij made the IDE 2021.2 sluggish and unuseable

(details in docs/06-jdk-bump.md)

Retry mid sep 2021 when java 17 gets out and gets supported by javabuildpack bumped in paas-templates

• https://adoptopenjdk.net/support.html
• https://github.com/cloudfoundry/java-buildpack/releases

[gberche-orange]

Status as of 29/11/2022
https://github.com/cloudfoundry/java-buildpack/releases/tag/v4.53 now uses openjdk build Liberica from bellsoft https://bell-sw.com/pages/liberica-release-notes-17.0.5/

https://en.wikipedia.org/wiki/OpenJDK lists openjdk builds

Due to Oracle no longer releasing updates for long-term support (LTS) releases under a permissive license, others have begun offering builds.[22][23][24] Linux distributions have always offered their own builds, and Windows also offers one now;

https://en.wikipedia.org/wiki/Adoptium
https://adoptium.net/support/

Java Version	First Availability	Latest Release	Next Release Due	End of Availability [1]
Java 20	Expected Mar 2023	Not available	Expected Mar 2023	Expected Sep 2023
Java 19	Sep 2022	20 Oct 2022 jdk-19.0.1+10	17 Jan 2023 jdk-19.0.2	Mar 2023
Java 18	Mar 2022	28 Aug 2022 jdk-18.0.2.1+1	EOSL[2]	Sep 2022
Java 17 (LTS)	Sep 2021	18 Oct 2022 jdk-17.0.5+8	17 Jan 2023 jdk-17.0.6	At least Oct 2027