chore(nxext): update to Nx 18

[nx-cloud[bot]]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit e97eb42b37f9c91b416a1ee99af5e385244dba3f. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this CI Pipeline Execution

---

✅ Successfully ran 4 targets

- [`nx affected --target=test --parallel=3 --ci --code-coverage`](https://cloud.nx.app/runs/eSxEbBsvpM?utm_source=pull-request&utm_medium=comment) - [`nx affected --target=lint --parallel=3`](https://cloud.nx.app/runs/JPspfTXR2v?utm_source=pull-request&utm_medium=comment) - [`nx-cloud record -- pnpm exec nx format:check`](https://cloud.nx.app/runs/ImaysPwvAa?utm_source=pull-request&utm_medium=comment) - [`nx affected --target=build --parallel=3`](https://cloud.nx.app/runs/H9Fe1CZlBj?utm_source=pull-request&utm_medium=comment)

---

Sent with 💌 from NxCloud.