build(deps): bump mailslurp-client from 6.7.4 to 15.23.1

Bumps [mailslurp-client](https://github.com/mailslurp/mailslurp-client) from 6.7.4 to 15.23.1.
- [Changelog](https://github.com/mailslurp/mailslurp-client/blob/master/CHANGELOG.md)
- [Commits](https://github.com/mailslurp/mailslurp-client/commits/v15.23.1)

---
updated-dependencies:
- dependency-name: mailslurp-client
  dependency-version: 15.23.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

package.json

@@ -24,7 +24,7 @@
   "dependencies": {
     "chai": "^4.3.4",
     "expect": "^28.1.3",
-    "mailslurp-client": "^6.7.4",
+    "mailslurp-client": "^15.23.1",
     "ts-node": "^10.9.2"
   },
   "devDependencies": {