entryPoint is deprecated (includes fix)

[rglanz]

With Astro v4+, a warning pops up when the dev server is launched:

[WARN] The injected route "/admin" by netlify-cms specifies the entry point with the "entryPoint" property. This property is deprecated, please use "entrypoint" instead.

I've tested and this works by simply replacing entryPoint with entrypoint here:

astro-netlify-cms/integration/index.ts

Line 70 in 66d4f0f

entryPoint: 'astro-netlify-cms/admin-dashboard.astro',