Update 2 npm dependencies

Development Dependencies

* @typescript-eslint/eslint-plugin > 4.21.0
* @typescript-eslint/parser > 4.21.0

[atomist:generated]
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Author: atomist-bot

package-lock.json

@@ -62,8 +62,8 @@
     "@types/mocha": "^8.2.2",
     "@types/power-assert": "^1.5.3",
     "@types/semver": "^7.3.4",
-    "@typescript-eslint/eslint-plugin": "^4.20.0",
-    "@typescript-eslint/parser": "^4.20.0",
+    "@typescript-eslint/eslint-plugin": "^4.21.0",
+    "@typescript-eslint/parser": "^4.21.0",
     "eslint": "^7.23.0",
     "eslint-config-prettier": "^6.15.0",
     "eslint-plugin-prettier": "^3.3.1",