chore: 🤖 upgrade api addon to ember lts 3.20

addons/api/package.json

@@ -10,34 +10,32 @@
   "scripts": {
     "build:development": "ember build",
     "build": "ember build --environment=production",
-    "lint": "yarn lint:js",
+    "lint": "npm-run-all --aggregate-output --continue-on-error --parallel lint:*",
     "lint:js": "eslint .",
     "format": "npm run format:js",
     "format:js": "prettier --write '{addon,app,config,stories,tests}/**/*.js' *.js",
     "start": "ember serve",
     "test": "ember test",
-    "test:all": "ember try:each",
+    "test:ember-compatibility": "ember try:each",
     "doc:toc": "doctoc README.md"
   },
   "dependencies": {
-    "ember-cli-babel": "^7.17.2",
-    "ember-cli-htmlbars": "^4.2.2"
+    "ember-cli-babel": "^7.21.0",
+    "ember-cli-htmlbars": "^5.2.0"
   },
   "devDependencies": {
     "@ember/optional-features": "^1.3.0",
-    "@glimmer/component": "^1.0.0",
+    "@glimmer/component": "^1.0.1",
     "@glimmer/tracking": "^1.0.0",
-    "babel-eslint": "^10.0.3",
+    "babel-eslint": "^10.1.0",
     "broccoli-asset-rev": "^3.0.0",
     "doctoc": "^1.4.0",
-    "ember-auto-import": "^1.5.3",
-    "ember-cli": "~3.16.1",
+    "ember-auto-import": "^1.6.0",
+    "ember-cli": "~3.20.2",
     "ember-cli-dependency-checker": "^3.2.0",
-    "ember-cli-eslint": "^5.1.0",
     "ember-cli-inject-live-reload": "^2.0.2",
     "ember-cli-mirage": "^1.1.7",
     "ember-cli-sri": "^2.1.1",
-    "ember-cli-template-lint": "^1.0.0-beta.3",
     "ember-cli-uglify": "^3.0.0",
     "ember-cli-update": "^0.54.6",
     "ember-copy": "^1.0.0",
@@ -49,15 +47,18 @@
     "ember-load-initializers": "^2.1.1",
     "ember-maybe-import-regenerator": "^0.1.6",
     "ember-qunit": "^4.6.0",
-    "ember-resolver": "^7.0.0",
-    "ember-source": "~3.16.0",
+    "ember-resolver": "^8.0.0",
+    "ember-source": "~3.20.2",
     "ember-source-channel-url": "^2.0.1",
+    "ember-template-lint": "^2.9.1",
     "ember-try": "^1.4.0",
-    "eslint-plugin-ember": "^7.7.2",
-    "eslint-plugin-node": "^11.0.0",
+    "eslint": "^7.5.0",
+    "eslint-plugin-ember": "^8.9.1",
+    "eslint-plugin-node": "^11.1.0",
     "loader.js": "^4.7.0",
+    "npm-run-all": "^4.1.5",
     "prettier": "^2.0.5",
-    "qunit-dom": "^1.0.0"
+    "qunit-dom": "^1.2.0"
   },
   "engines": {
     "node": "10.* || >= 12"