Bump @stellar/stellar-sdk in /dapp in the npm-minor group

Bumps the npm-minor group in /dapp with 1 update: [@stellar/stellar-sdk](https://github.com/stellar/js-stellar-sdk).


Updates `@stellar/stellar-sdk` from 12.2.0 to 12.3.0
- [Release notes](https://github.com/stellar/js-stellar-sdk/releases)
- [Changelog](https://github.com/stellar/js-stellar-sdk/blob/master/CHANGELOG.md)
- [Commits](stellar/js-stellar-sdk@v12.2.0...v12.3.0)

---
updated-dependencies:
- dependency-name: "@stellar/stellar-sdk"
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm-minor
...

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

dapp/packages/soroban_versioning/package.json

@@ -9,7 +9,7 @@
   },
   "dependencies": {
     "buffer": "6.0.3",
-    "@stellar/stellar-sdk": "12.2.0"
+    "@stellar/stellar-sdk": "12.3.0"
   },
   "devDependencies": {
     "typescript": "5.6.2"