chore: update tests to Astro 5

[irbull]

Updates the Deno Astro Adapter to Astro 5.0. This includes updating the dependencies in the package.json and removing the warning about static output mode. The static output mode has been removed in Astro 5.0 [1,2].

[1] https://5-0-0-beta--astro-docs-2.netlify.app/en/guides/upgrade-to/v5/#removed-hybrid-rendering-mode
[2] https://astro.build/blog/astro-5/

This change-set also update the README as we can now build with Deno 2.0 This was introduced in commit f8d18fd

[irbull]

Don't review this yet. I've noticed a slight improvement I can make. Astro 5 has removed hybrid support, but this adapter still checks for it.

[irbull]

Don't review this yet. I've noticed a slight improvement I can make. Astro 5 has removed hybrid support, but this adapter still checks for it.

Should be good to go now. I removed the check for the static output option as it's the default now that they removed hybrid mode. I left a few links to the docs on this.

[kt3k]

Should be good to go now. I removed the check for the static output option as it's the default now that they removed hybrid mode. I left a few links to the docs on this.

Sounds reasonable to me as static mode now seems supporting optional server-side rendering https://astro.build/blog/astro-5/#simplified-prerendering

[kt3k]

LGTM

[kt3k]

Published as 0.2.0 (minor version bump because of the change of astro major version support) https://www.npmjs.com/package/@deno/astro-adapter/v/0.2.0

Thanks for your contribution!