chore(deps): bump @coreui/coreui to 5.9.0 and dev dependencies (#516)

Consume the freshly released @coreui/coreui 5.9.0 (lib + docs), and refresh astro 7.1.2, vite 8.1.5, vitest 4.1.10, eslint 9.39.5, prettier 3.9.5, typescript-eslint 8.64.0, npm 11.18.0.

Author: mrholek