Replace Java 19 by 21 (LTS) in CI

[abelsromero]

Kind of change

• Bug fix
• New non-breaking feature
• New breaking feature
• Documentation update
• Build improvement

Description

What is the goal of this pull request?

Test new Java LTS v21, and remove Java 19 which was not LTS.

How does it achieve that?

Replace Java17 in CI by Java21.
Also bumps SpringBoot test project to the latest 3.1.3.

Are there any alternative ways to implement this?

No

Are there any implications of this pull request? Anything a user must know?

No

Issue

If this PR fixes an open issue, please add a line of the form:

Fixes #Issue

Release notes

Please add a corresponding entry to the file CHANGELOG.adoc

[abelsromero]

😞 not yet available

   Trying to resolve the latest version from remote
  Error: Could not find satisfied version for SemVer '21'. 
  Available versions: 20.0.2+9, 20.0.1+9, 20.0.0+36, 19.0.2+7, 19.0.1+10, 19.0.0+36, 18.0.2+101, 18.0.2+9, 18.0.1+10, 18.0.0+36, 17.0.8+101, 17.0.8+7, 17.0.7+7, 17.0.6+10, 17.0.5+8, 17.0.4+101, 17.0.4+8, 17.0.3+7, 17.0.2+8, 17.0.1+12, 17.0.0+35, 16.0.2+7, 11.0.20+101, 11.0.20+8, 11.0.19+7, 11.0.18+10, 11.0.17+8, 11.0.16+101, 11.0.16+8, 11.0.15+10, 11.0.14+101, 11.0.14+9, 11.0.13+8, 11.0.12+7, 8.0.382+5, 8.0.372+7, 8.0.362+9, 8.0.352+8, 8.0.345+1, 8.0.342+7, 8.0.332+9, 8.0.322+6, 8.0.312+7, 8.0.302+8

Fun fact Graal is already available with graalvm/setup-graalvm@v1.

[abelsromero]

I am thinking maybe we need to set a different distribution that is not temurin, sdkman has 21-open. I'll try later

[abelsromero]

An Update, oracle distro is available, but only for 21, so I could fix Linux builds with some duplicated if conditions (not nice). It works for now but conflicts with other steps we run with if: always(), I'd give it another spin another moment.

[abelsromero]

Still waiting 😞 ... https://adoptium.net/temurin/nightly/?version=21

[abelsromero]

Updated configuration now that the Java 21 Temurin is available!