fix(kms): pin @openzeppelin/contracts-upgradeable to 5.4.0

OZ 5.6.x removed __UUPSUpgradeable_init() which breaks contract compilation.

Author: kvinwang

kms/auth-eth/package-lock.json

@@ -15,7 +15,7 @@
   "dependencies": {
     "@fastify/swagger": "^8.12.0",
     "@fastify/swagger-ui": "^2.0.1",
-    "@openzeppelin/contracts-upgradeable": "^5.4.0",
+    "@openzeppelin/contracts-upgradeable": "5.4.0",
     "dotenv": "^16.3.1",
     "ethers": "^6.13.5",
     "fastify": "^5.8.1",