build(deps-dev): bump njs-types from 0.9.1 to 0.9.4

Bumps [njs-types](https://github.com/nginx/njs) from 0.9.1 to 0.9.4.
- [Release notes](https://github.com/nginx/njs/releases)
- [Changelog](https://github.com/nginx/njs/blob/master/CHANGES)
- [Commits](nginx/njs@0.9.1...0.9.4)

---
updated-dependencies:
- dependency-name: njs-types
  dependency-version: 0.9.4
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package-lock.json

@@ -2,7 +2,7 @@
   "devDependencies": {
     "better-docs": "^2.7.3",
     "jsdoc": "^4.0.4",
-    "njs-types": "^0.9.1",
+    "njs-types": "^0.9.4",
     "taffydb": "^2.7.3"
   }
 }