fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-MONGOOSE-8446504

package.json

@@ -54,7 +54,7 @@
     "googlethis": "^1.8.0",
     "got": "^12.5.3",
     "libsodium-wrappers": "^0.7.10",
-    "mongoose": "^6.11.3",
+    "mongoose": "^8.8.3",
     "node-fetch": "^3.3.1",
     "pretty-seconds-spanish": "^2.1.1",
     "rockpaperscissors-checker": "^1.2.0",