build: change to old method of specifying es modules, new one doesn't play nicely with jest.

Author: Codex-

package.json

@@ -3,7 +3,6 @@
   "version": "2.0.2",
   "author": "Alex Miller <codex.nz@gmail.com>",
   "description": "Execute a given command after a bundle has been written",
-  "type": "module",
   "homepage": "https://github.com/Codex-/rollup-plugin-conditional-exec#readme",
   "repository": {
     "type": "git",
@@ -20,6 +19,7 @@
     "exec"
   ],
   "main": "dist/cjs/index.js",
+  "module": "dist/esm/index.js",
   "types": "dist/cjs/index.d.ts",
   "exports": {
     ".": {
@@ -28,7 +28,7 @@
         "default": "./dist/esm/index.js"
       },
       "require": {
-        "types": "./dist/cjs/index.d.cts",
+        "types": "./dist/cjs/index.d.ts",
         "default": "./dist/cjs/index.js"
       }
     }