build(deps-dev): bump test-smtp-server from 0.9.6 to 0.9.7

Bumps [test-smtp-server](https://github.com/webstech/test-smtp-server) from 0.9.6 to 0.9.7.
- [Release notes](https://github.com/webstech/test-smtp-server/releases)
- [Commits](webstech/test-smtp-server@v0.9.6...v0.9.7)

---
updated-dependencies:
- dependency-name: test-smtp-server
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -56,7 +56,7 @@
     "eslint-plugin-jsdoc": "^39.6.4",
     "jest": "^28.1.3",
     "jest-junit": "^15.0.0",
-    "test-smtp-server": "0.9.6",
+    "test-smtp-server": "0.9.7",
     "ts-jest": "^28.0.8",
     "ts-node": "^10.9.1",
     "typescript": "^4.9.4"