feat!: upgrade to nx 19

[NachoVazquez]

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: CONTRIBUTING.md#commit
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[x] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Build related changes
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

We are using nx 18

What is the new behavior?

We are using nx 19

Does this PR introduce a breaking change?

[x] Yes
[ ] No

We only support dependencies to Nx 19 plugins

[cloudflare-pages[bot]]

Deploying nx-cloudflare-next-example with    Cloudflare Pages

Latest commit:	0bca834
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Preview URL:	https://89bcbb5e.oss-9xl.pages.dev
Branch Preview URL:	https://feature-upgrade-to-nx-19.oss-9xl.pages.dev

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