chore(deps): update dependency mercurius to v16.4.0 (#3698)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

packages/mercurius/package.json

@@ -33,7 +33,7 @@
     "@nestjs/platform-fastify": "11.1.6",
     "@nestjs/testing": "11.1.6",
     "fastify": "5.6.1",
-    "mercurius": "16.2.0",
+    "mercurius": "16.4.0",
     "mercurius-integration-testing": "9.0.1"
   },
   "peerDependencies": {

yarn.lock

@@ -8031,10 +8031,10 @@ [email protected]:
     cookie "^1.0.0"
     ws "^8.12.1"
 
-mercurius@16.2.0:
-  version "16.2.0"
-  resolved "https://registry.yarnpkg.com/mercurius/-/mercurius-16.2.0.tgz#da5a60b3f36b8f7179eb314fe42eb40f0f76211a"
-  integrity sha512-I2+KRkC6MVbf44FN7hopWXj+OzS1nKLwN7brAkpd3MLTz9mQgWMYdnrk2ETVaG6yD3x9zIIzuRrCQcuWHyFL1w==
+mercurius@16.4.0:
+  version "16.4.0"
+  resolved "https://registry.yarnpkg.com/mercurius/-/mercurius-16.4.0.tgz#8c76a006eff26612afd727d66908d2edc1caf5bb"
+  integrity sha512-RZ/iqPY4xn0nzpEG9qczgkBlufqlmDmXmRfhokhkALIEyvYyzaIwGje24ITJ8Sj6eY3AeogxVtZLIPnDpL+qOg==
   dependencies:
     "@fastify/error" "^4.0.0"
     "@fastify/static" "^8.0.0"