Fix nodenext module support from TypeScript 4.7

* as per microsoft/TypeScript#48235 (comment)
* follow-up preactjs/preact#3513

Author: wight554

package.json

@@ -8,31 +8,36 @@
   "types": "dist/htm.d.ts",
   "exports": {
     ".": {
+      "types": "./src/index.d.ts",
       "browser": "./dist/htm.module.js",
       "umd": "./dist/htm.umd.js",
       "import": "./dist/htm.mjs",
       "require": "./dist/htm.js"
     },
     "./": "./",
     "./preact": {
+      "types": "./preact/index.d.ts",
       "browser": "./preact/index.module.js",
       "umd": "./preact/index.umd.js",
       "import": "./preact/index.mjs",
       "require": "./preact/index.js"
     },
     "./preact/standalone": {
+      "types": "./preact/index.d.ts",
       "browser": "./preact/standalone.module.js",
       "umd": "./preact/standalone.umd.js",
       "import": "./preact/standalone.mjs",
       "require": "./preact/standalone.js"
     },
     "./react": {
+      "types": "./react/index.d.ts",
       "browser": "./react/index.module.js",
       "umd": "./react/index.umd.js",
       "import": "./react/index.mjs",
       "require": "./react/index.js"
     },
     "./mini": {
+      "types": "./mini/index.d.ts",
       "browser": "./mini/index.module.js",
       "umd": "./mini/index.umd.js",
       "import": "./mini/index.mjs",