build(deps-dev): bump supertest from 6.1.4 to 6.3.4

Bumps [supertest](https://github.com/ladjs/supertest) from 6.1.4 to 6.3.4.
- [Release notes](https://github.com/ladjs/supertest/releases)
- [Commits](forwardemail/supertest@v6.1.4...v6.3.4)

---
updated-dependencies:
- dependency-name: supertest
  dependency-version: 6.3.4
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

package.json

@@ -45,7 +45,7 @@
     "eslint-plugin-standard": "4.1.0",
     "mocha": "9.1.3",
     "rimraf": "3.0.2",
-    "supertest": "6.1.4",
+    "supertest": "6.3.4",
     "tree-kill": "1.2.2",
     "uid-safe": "2.1.5",
     "validate-npm-package-name": "3.0.0"