Update tsconfig.json to use node16 module resolution

Reviewed-by: Titus Wormer <tituswormer@gmail.com>

Closes GH-1106.

Author: ChristianMurphy

packages/remark-cli/tsconfig.json

@@ -1,4 +1,7 @@
 {
   "extends": "../../tsconfig.json",
-  "include": ["*.js"]
+  "include": ["*.js"],
+  "compilerOptions": {
+    "resolveJsonModule": true
+  }
 }

tsconfig.json

@@ -1,16 +1,12 @@
 {
   "include": ["script/**/*.js", "test/**/*.js"],
   "compilerOptions": {
-    "target": "ES2020",
-    "lib": ["ES2020"],
-    "module": "ES2020",
-    "moduleResolution": "node",
-    "resolveJsonModule": true,
-    "allowJs": true,
+    "target": "es2021",
+    "lib": ["es2021"],
+    "module": "node16",
     "checkJs": true,
     "declaration": true,
     "emitDeclarationOnly": true,
-    "allowSyntheticDefaultImports": true,
     "skipLibCheck": true,
     "strict": true
   }