Bump axios from 0.19.2 to 0.21.1 in /extensions/azurecore (#13922)

Bumps [axios](https://github.com/axios/axios) from 0.19.2 to 0.21.1.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/v0.21.1/CHANGELOG.md)
- [Commits](https://github.com/axios/axios/compare/v0.19.2...v0.21.1)

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extensions/azurecore/package.json

@@ -322,7 +322,7 @@
   "dependencies": {
     "@azure/arm-resourcegraph": "^2.0.0",
     "@azure/arm-subscriptions": "1.0.0",
-    "axios": "^0.19.2",
+    "axios": "^0.21.1",
     "qs": "^6.9.1",
     "vscode-nls": "^4.0.0",
     "ws": "^7.2.0"