[Tests] skip npm ls in older nodes

Author: ljharb

.github/workflows/node-aught.yml

@@ -9,4 +9,4 @@ jobs:
       range: '< 10'
       type: minors
       command: npm run tests-only
-      skip-ls-check: false
+      skip-ls-check: true

.github/workflows/node-harmony.yml

@@ -9,3 +9,4 @@ jobs:
       range: '>=0.4 <16'
       type: minors
       command: npm run test:harmony
+        skip-ls-check: true