Use JDK 8 for release (JAXB plugin requires it)

Author: jaymcnallie

.github/workflows/release.yml

@@ -43,7 +43,7 @@ jobs:
       next_dev_version: ${{ inputs.nextDevVersion }}
       skip_tests: ${{ inputs.skipTests }}
       test_run: ${{ inputs.testRun }}
-      jdk_version_map: '{"master":"11","default":"11"}'
+      jdk_version_map: '{"master":"8","default":"8"}'
       artifact_path: 'target'
       resume_from: ${{ inputs.resumeFrom }}
       author_name: 'Codice Release Manager'