chore(deps): bump axios from 0.20.0 to 0.21.1

Bumps [axios](https://github.com/axios/axios) from 0.20.0 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/v0.20.0...v0.21.1)

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

plugins/rollbar-backend/package.json

@@ -33,7 +33,7 @@
     "@backstage/backend-common": "^0.4.0",
     "@backstage/config": "^0.1.2",
     "@types/express": "^4.17.6",
-    "axios": "^0.20.0",
+    "axios": "^0.21.1",
     "camelcase-keys": "^6.2.2",
     "compression": "^1.7.4",
     "cors": "^2.8.5",