chore: match TypeScript base settings to Node.js 16.x (#295)

See https://github.com/microsoft/TypeScript/wiki/Node-Target-Mapping.

Author: LayZeeDK

tsconfig.base.json

@@ -8,9 +8,9 @@
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
     "importHelpers": true,
-    "target": "es2015",
+    "target": "ES2021",
     "module": "esnext",
-    "lib": ["es2017", "dom"],
+    "lib": ["DOM", "ES2021"],
     "skipLibCheck": true,
     "skipDefaultLibCheck": true,
     "baseUrl": ".",