upgrade-dev-deps: Upgrade dev packages to latest versions

Upgraded packages include:
* @types/jest: ^24.0.18 -> ^26.0.23
* @types/node: 12.7.8 -> ^15.2.5
* @typescript-eslint/eslint-plugin: ^2.22.0 -> ^4.28.1
* @typescript-eslint/parser: ^2.22.0 -> ^4.28.1
* eslint: ^6.8.0 -> ^7.29.0
* husky: ^4.2.3 -> ^6.0.0
* jest: ^24.9.0 -> ^27.0.6
* prettier: ^1.19.1 -> 2.3.2
* ts-jest: ^24.1.0 -> 27.0.3
* typescript: ^3.6.3 -> ^4.3.4
* uglify-js: ^3.6.0 -> ^3.13.10

package.json

@@ -22,18 +22,18 @@
   },
   "devDependencies": {
     "@types/co": "^4.6.2",
-    "@types/jest": "^24.0.18",
-    "@types/node": "^12.7.8",
-    "@typescript-eslint/eslint-plugin": "^2.22.0",
-    "@typescript-eslint/parser": "^2.22.0",
+    "@types/jest": "^26.0.23",
+    "@types/node": "^15.12.5",
+    "@typescript-eslint/eslint-plugin": "^4.28.1",
+    "@typescript-eslint/parser": "^4.28.1",
     "co": "^4.6.0",
-    "eslint": "^6.8.0",
-    "husky": "^4.2.3",
-    "jest": "^24.9.0",
-    "prettier": "^1.19.1",
-    "ts-jest": "^24.1.0",
-    "typescript": "^3.6.3",
-    "uglify-js": "^3.6.0"
+    "eslint": "^7.29.0",
+    "husky": "^6.0.0",
+    "jest": "^27.0.6",
+    "prettier": "^2.3.2",
+    "ts-jest": "^27.0.3",
+    "typescript": "^4.3.4",
+    "uglify-js": "^3.13.10"
   },
   "jest": {
     "verbose": true,