Bump axios from 0.19.2 to 0.21.1 in /terminus-plugin-manager

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)

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

terminus-plugin-manager/package.json

@@ -18,7 +18,7 @@
   "license": "MIT",
   "devDependencies": {
     "@types/semver": "^7.1.0",
-    "axios": "^0.19.0",
+    "axios": "^0.21.1",
     "electron-promise-ipc": "^2.2.4",
     "mz": "^2.6.0",
     "semver": "^7.1.1"