SpringBoot ISSUE-40417 ISSUE-40418 update java 21, 17 in CI image and java 17 in…

… .sdkmanrc

ISSUE-#40417: Upgrade Java 17 version in CI image and .sdkmanrc ISSUE-#40418: Upgrade Java 21 version in CI image

Comment From: scottfrederick

Thanks @Bhaskar1312, but we prefer to take care of these updates ourselves, as we have to start with older versions and merge the changes forward.