Bump tfx-cli in /cantarus-polydeploy-client-installer

Bumps [tfx-cli](https://github.com/Microsoft/tfs-cli) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/Microsoft/tfs-cli/releases)
- [Commits](https://github.com/Microsoft/tfs-cli/commits)

---
updated-dependencies:
- dependency-name: tfx-cli
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

cantarus-polydeploy-client-installer/package-lock.json

@@ -18,7 +18,7 @@
     "semver": "^7.7.1"
   },
   "devDependencies": {
-    "tfx-cli": "^0.20.0"
+    "tfx-cli": "^0.21.0"
   },
   "scripts": {
     "package": "cd .. && tfx extension create --manifest-globs vss-extension.json"