build(deps-dev): Bump @types/webpack-env from 1.18.7 to 1.18.8

Bumps [@types/webpack-env](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/webpack-env) from 1.18.7 to 1.18.8.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/webpack-env)

---
updated-dependencies:
- dependency-name: "@types/webpack-env"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -71,7 +71,7 @@
     "@nextcloud/webpack-vue-config": "^6.2.0",
     "@types/jest": "^29.5.14",
     "@types/lodash": "^4.17.15",
-    "@types/webpack-env": "^1.18.7",
+    "@types/webpack-env": "^1.18.8",
     "@vue/test-utils": "^1.3.0",
     "jest": "^29.7.0",
     "jest-environment-jsdom": "^29.7.0",