Bump @next/env from 14.2.3 to 14.2.15

Bumps [@next/env](https://github.com/vercel/next.js/tree/HEAD/packages/next-env) from 14.2.3 to 14.2.15.
- [Release notes](https://github.com/vercel/next.js/releases)
- [Changelog](https://github.com/vercel/next.js/blob/canary/release.js)
- [Commits](https://github.com/vercel/next.js/commits/v14.2.15/packages/next-env)

---
updated-dependencies:
- dependency-name: "@next/env"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

package.json

@@ -21,7 +21,7 @@
         "@navikt/ds-react": "^6.8.0",
         "@navikt/ds-tailwind": "^6.8.0",
         "@navikt/ds-tokens": "^6.8.0",
-        "@next/env": "^14.2.3",
+        "@next/env": "^14.2.15",
         "@tanstack/react-query": "^5.39.0",
         "array-shuffle": "^3.0.0",
         "classnames": "^2.5.1",