Update linting package versions.

Author: Robert Jackson

package.json

@@ -36,10 +36,10 @@
     "broccoli-test-helper": "^2.0.0",
     "ember-cli": "~3.20.0",
     "ember-cli-dependency-checker": "^3.2.0",
-    "eslint": "^6.8.0",
-    "eslint-plugin-node": "^11.0.0",
+    "eslint": "^7.7.0",
+    "eslint-plugin-node": "^11.1.0",
     "execa": "^4.0.3",
-    "prettier": "^1.19.1",
+    "prettier": "^2.1.1",
     "qunit": "^2.11.1",
     "release-it": "^12.4.3",
     "release-it-lerna-changelog": "^1.0.3"