feat: upgrade stellar-sdk from 10.4.1 to 12.0.0

Snyk has created this PR to upgrade stellar-sdk from 10.4.1 to 12.0.0.

See this package in npm:
stellar-sdk

See this project in Snyk:
https://app.snyk.io/org/okeamah/project/dbc3fd58-52be-4b8d-95be-b7f46d7c9e8f?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -105,7 +105,7 @@
     "querystring": "^0.2.1",
     "randombytes": "^2.1.0",
     "soroban-client": "1.0.0-beta.4",
-    "stellar-sdk": "^10.4.1",
+    "stellar-sdk": "^12.0.0",
     "timed-cache": "^2.0.0",
     "tronweb": "^4.4.0",
     "web3": "1.9.0",