fix(deps): update dependency prom-client to v15

Author: renovate[bot]

package.json

@@ -9,7 +9,7 @@
         "@sentry/tracing": "^7.2.0",
         "ethers": "^6.0.0",
         "node-fetch": "^2.6.1",
-        "prom-client": "^14.2.0",
+        "prom-client": "^15.0.0",
         "zksync-web3": "^0.17.0"
     },
     "devDependencies": {