Remove stable image from test_inst_latest

Author: sarahchen6

.gitlab-ci.yml

@@ -491,7 +491,7 @@ test_inst_latest:
     CACHE_TYPE: "latestDep"
   parallel:
     matrix:
-      - testJvm: ["8", "17", "21", "stable"]
+      - testJvm: ["8", "17", "21"]
         # Gitlab doesn't support "parallel" and "parallel:matrix" at the same time
         # This emulates "parallel" by including it in the matrix
         CI_SPLIT: [ "1/6", "2/6", "3/6", "4/6", "5/6", "6/6"]