bmon(chore): Fix package name

.changeset/great-cherries-bake.md

 ---
-'minimum-balance-agent': patch
+'@eth-optimism/balance-monitor': patch
 ---
 
 Added basic balance monitoring

.changeset/weak-crabs-reflect.md

 ---
-'minimum-balance-agent': patch
+'@eth-optimism/balance-monitor': patch
 ---
 
 Created the Balance Monitoring package

packages/balance-monitor/package.json

 {
-  "name": "@eth-optimism/minimum-balance-agent",
+  "name": "@eth-optimism/balance-monitor",
   "version": "0.0.1",
   "description": "Forta Agent that reports whether certain accounts have fallen below some balance",
   "homepage": "https://github.com/ethereum-optimism/optimism/tree/develop/packages/balance-monitor#readme",