fix(deps): update dependency dotenv to v15

Author: renovate-bot

package-lock.json

@@ -6,7 +6,7 @@
   "dependencies": {
     "@keyv/sqlite": "^2.0.2",
     "discord.js": "^12.5.3",
-    "dotenv": "^10.0.0",
+    "dotenv": "^15.0.0",
     "express": "^4.17.2",
     "gcommands": "^5.2.3",
     "keyv": "^4.0.5"