fix: upgrade @contentstack/cli-cm-export from 1.18.0 to 1.20.1

Snyk has created this PR to upgrade @contentstack/cli-cm-export from 1.18.0 to 1.20.1.

See this package in npm:
@contentstack/cli-cm-export

See this project in Snyk:
https://app.snyk.io/org/contentstack-devex/project/5fa50751-dadd-42e3-8abb-5c787d6308a8?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

package-lock.json

@@ -5,7 +5,7 @@
   "author": "Contentstack",
   "bugs": "https://github.com/contentstack/cli/issues",
   "dependencies": {
-    "@contentstack/cli-cm-export": "~1.18.0",
+    "@contentstack/cli-cm-export": "~1.20.1",
     "@contentstack/cli-command": "~1.6.0",
     "@contentstack/cli-utilities": "~1.13.0",
     "@oclif/core": "^4.3.0",