chore(deps): Update @hashgraph/sdk requirement

Updates the requirements on [@hashgraph/sdk](https://github.com/hashgraph/hedera-sdk-js) to permit the latest version.
- [Release notes](https://github.com/hashgraph/hedera-sdk-js/releases)
- [Changelog](https://github.com/hashgraph/hedera-sdk-js/blob/main/CHANGELOG.md)
- [Commits](hashgraph/hedera-sdk-js@v2.50.0...v2.56.0)

---
updated-dependencies:
- dependency-name: "@hashgraph/sdk"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

packages/hedera-wallet-snap/packages/site/package.json

@@ -25,7 +25,7 @@
     ]
   },
   "dependencies": {
-    "@hashgraph/sdk": "^2.50.0",
+    "@hashgraph/sdk": "^2.56.0",
     "@metamask/providers": "^17.2.0",
     "bignumber.js": "^9.1.2",
     "bootstrap": "^5.3.3",