fix(deps): update dependency mercurius to v16

Author: renovate[bot]

package.json

@@ -32,7 +32,7 @@
     "class-validator": "^0.14.0",
     "fastify": "^4.12.0",
     "graphql": "^16.6.0",
-    "mercurius": "^14.0.0",
+    "mercurius": "^16.0.0",
     "mongoose": "^8.0.0",
     "nestjs-pino": "^4.0.0",
     "passport": "^0.7.0",