[代码优化](v2.6)：update axios version

package.json

@@ -34,7 +34,7 @@
   },
   "dependencies": {
     "@riophae/vue-treeselect": "0.4.0",
-    "axios": "0.18.1",
+    "axios": "^0.21.1",
     "clipboard": "2.0.4",
     "codemirror": "^5.49.2",
     "connect": "3.6.6",