Include Java versions 21, 22, 23, 24 in CI (#1987)

* Include Java versions 21, 22, 23, 24 in CI

* Added a comment about Java testing strategy

* Added a comment about Java testing strategy

Author: prathmesh-stripe

.github/workflows/ci.yml

@@ -51,13 +51,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
+        # We test Stripe SDK against Java LTS versions(8, 11, 17, 21) and currently supported non-LTS versions.
+        # https://www.oracle.com/java/technologies/java-se-support-roadmap.html
         java-version:
           - "1.8"
           - "11"
           - "17"
-          - "18"
-          - "19"
-          - "20"
+          - "21"
+          - "22"
+          - "23"
+          - "24"
 
     steps:
       - uses: extractions/setup-just@v2