Remove pre-JDK17 targets from v3 rebuild

Author: cowtowncoder

.github/workflows/dep_build_v3.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        java_version: ['8', '17', '21']
+        java_version: ['17', '21']
     env:
       JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
     steps: