chore(nxext): update to Nx 19

[nx-cloud[bot]]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit bb65dea6aecb0df1dcb33d918bb2bab2e79e23e6. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

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✅ Successfully ran 4 targets

- [`nx affected --target=test --parallel=3 --ci --code-coverage`](https://cloud.nx.app/runs/fUSql3y9uJ?utm_source=pull-request&utm_medium=comment) - [`nx affected --target=lint --parallel=3`](https://cloud.nx.app/runs/f9uhu4PcBm?utm_source=pull-request&utm_medium=comment) - [`nx affected --target=build --parallel=3`](https://cloud.nx.app/runs/7WkpeuJU8v?utm_source=pull-request&utm_medium=comment) - [`nx-cloud record -- pnpm exec nx format:check`](https://cloud.nx.app/runs/dKEMaNk6Li?utm_source=pull-request&utm_medium=comment)

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