fix: use export in package.json to reference ESM

Author: woehrl01

package.json

@@ -2,6 +2,10 @@
   "name": "tsyringe",
   "version": "4.9.1",
   "description": "Lightweight dependency injection container for JavaScript/TypeScript",
+  "exports": {
+    "require": "./dist/cjs/index.js",
+    "import": "./dist/esm2015/index.js"
+  },
   "main": "dist/cjs/index.js",
   "module": "./dist/esm5/index.js",
   "es2015": "./dist/esm2015/index.js",