build: add dotenv to optional peer deps

Author: pi0

package.json

@@ -170,12 +170,16 @@
     "youch-core": "^0.3.3"
   },
   "peerDependencies": {
+    "dotenv": "*",
     "jiti": "^2",
     "rollup": "^4.57.0",
     "vite": "^7 || ^8 || >=8.0.0-0",
     "xml2js": "^0.6.2"
   },
   "peerDependenciesMeta": {
+    "dotenv": {
+      "optional": true
+    },
     "rollup": {
       "optional": true
     },