Bump axios from 0.19.0 to 0.21.2

Bumps [axios](https://github.com/axios/axios) from 0.19.0 to 0.21.2.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/master/CHANGELOG.md)
- [Commits](axios/axios@v0.19.0...v0.21.2)

---
updated-dependencies:
- dependency-name: axios
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -21,7 +21,7 @@
   },
   "dependencies": {
     "@google-cloud/pubsub": "^0.31.0",
-    "axios": "^0.19.0",
+    "axios": "^0.21.2",
     "cors": "^2.8.5",
     "express": "^4.17.1",
     "firebase-admin": "^8.4.0",