Bump @types/node from 14.17.4 to 15.12.5

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 14.17.4 to 15.12.5.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

---
updated-dependencies:
- dependency-name: "@types/node"
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

package.json

@@ -54,7 +54,7 @@
     "@types/gettext-parser": "^4.0.0",
     "@types/gm": "^1.18.9",
     "@types/morgan": "^1.9.2",
-    "@types/node": "^14.17.4",
+    "@types/node": "^15.12.5",
     "@types/passport": "^1.0.6",
     "@types/passport-http-bearer": "^1.0.36",
     "@types/passport-local": "^1.0.33",