Update dependencies

package.json

@@ -24,16 +24,16 @@
   "prettier": "@github/prettier-config",
   "devDependencies": {
     "@github/prettier-config": "0.0.4",
-    "chai": "^4.1.2",
-    "eslint": "^6.8.0",
-    "eslint-plugin-github": "^4.0.1",
-    "karma": "^5.1.0",
+    "chai": "^4.3.4",
+    "eslint": "^7.24.0",
+    "eslint-plugin-github": "^4.1.3",
+    "karma": "^6.3.2",
     "karma-chai": "^0.1.0",
     "karma-chrome-launcher": "^3.1.0",
-    "karma-firefox-launcher": "^1.3.0",
+    "karma-firefox-launcher": "^2.1.0",
     "karma-mocha": "^2.0.1",
     "karma-mocha-reporter": "^2.2.5",
-    "mocha": "^8.0.1",
-    "typescript": "^3.7.5"
+    "mocha": "^8.3.2",
+    "typescript": "^4.2.4"
   }
 }