Bump axios from 0.21.1 to 0.21.2 in /back

Bumps [axios](https://github.com/axios/axios) from 0.21.1 to 0.21.2.
- [Release notes](https://github.com/axios/axios/releases)
- [Changelog](https://github.com/axios/axios/blob/master/CHANGELOG.md)
- [Commits](https://github.com/axios/axios/compare/v0.21.1...v0.21.2)

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

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

back/package.json

@@ -41,7 +41,7 @@
   "homepage": "https://github.com/thecodingmachine/workadventure#readme",
   "dependencies": {
     "@workadventure/tiled-map-type-guard": "^1.0.2",
-    "axios": "^0.21.1",
+    "axios": "^0.21.2",
     "busboy": "^0.3.1",
     "circular-json": "^0.5.9",
     "debug": "^4.3.1",