fix: Pin @types/superagent version to avoid build problems (#4802)

Author: jcesarmobile

packages/@ionic/cli/package.json

@@ -78,7 +78,7 @@
     "@types/os-name": "^3.1.0",
     "@types/semver": "^7.1.0",
     "@types/split2": "^2.1.6",
-    "@types/superagent": "^4.1.3",
+    "@types/superagent": "4.1.3",
     "@types/superagent-proxy": "^3.0.0",
     "@types/tar": "^4.0.0",
     "jest": "^26.4.2",