Update SDKMan Java version (#1068)

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.java.migrate.UpdateSdkMan?organizationId=QUxML09wZW4gU291cmNlL09wZW5SZXdyaXRl#defaults=W3sidmFsdWUiOiIyMS4wLjgiLCJuYW1lIjoibmV3VmVyc2lvbiJ9LHsidmFsdWUiOiJ0ZW0iLCJuYW1lIjoibmV3RGlzdHJpYnV0aW9uIn1d

Co-authored-by: Moderne <[email protected]>

Author: timtebeek

.sdkmanrc

@@ -1,3 +1,3 @@
 # Enable auto-env through the sdkman_auto_env config
 # Add key=value pairs of SDKs to use below
-java=17.0.12-tem
+java=21.0.8-tem