chore: bump es6-promisify from 6.1.1 to 7.0.0

Bumps [es6-promisify](https://github.com/mikehall314/es6-promisify) from 6.1.1 to 7.0.0.
- [Release notes](https://github.com/mikehall314/es6-promisify/releases)
- [Commits](mikehall314/es6-promisify@v6.1.1...v7.0.0)

---
updated-dependencies:
- dependency-name: es6-promisify
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

package.json

@@ -28,7 +28,7 @@
     "cookie-parser": "^1.4.3",
     "dompurify": "^2.0.0",
     "dotenv": "^8.0.0",
-    "es6-promisify": "^6.0.0",
+    "es6-promisify": "^7.0.0",
     "express": "^4.15.2",
     "express-session": "^1.15.1",
     "express-validator": "^6.0.0",