ci: change node 14 version

Author: sxzz

.github/workflows/unit-test.yml

@@ -15,7 +15,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        node-version: ['14', '16']
+        node-version: ['14.15', '16']
 
     steps:
       - uses: actions/checkout@v3