build(deps-dev): Bump @types/webpack-env from 1.18.6 to 1.18.8

Bumps [@types/webpack-env](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/webpack-env) from 1.18.6 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

@@ -32,7 +32,7 @@
     "@types/react": "^17.0.43",
     "@types/react-dom": "^17.0.0",
     "@types/webpack": "^5.28.5",
-    "@types/webpack-env": "^1.18.6",
+    "@types/webpack-env": "^1.18.8",
     "@vue/test-utils": "^1.3.6",
     "@vue/tsconfig": "^0.5.1",
     "@vue/vue2-jest": "^29.2.6",