fix(deps): update dependency astro to v4.12.0

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
astro (source)	`4.11.6` -> `4.12.0`

Release Notes

withastro/astro (astro)

### [`v4.12.0`](https://togithub.com/withastro/astro/blob/HEAD/packages/astro/CHANGELOG.md#4120) [Compare Source](https://togithub.com/withastro/astro/compare/astro@4.11.6...astro@4.12.0) ##### Minor Changes - [#11341](https://togithub.com/withastro/astro/pull/11341) [`49b5145`](https://togithub.com/withastro/astro/commit/49b5145158a603b9bb951bf914a6a9780c218704) Thanks [@madcampos](https://togithub.com/madcampos)! - Adds support for [Shiki's `defaultColor` option](https://shiki.style/guide/dual-themes#without-default-color). This option allows you to override the values of a theme's inline style, adding only CSS variables to give you more flexibility in applying multiple color themes. Configure `defaultColor: false` in your Shiki config to apply throughout your site, or pass to Astro's built-in `

` component to style an individual code block.

    ```js title="astro.config.mjs"
    import { defineConfig } from 'astro/config';
    export default defineConfig({
      markdown: {
        shikiConfig: {
          themes: {
            light: 'github-light',
            dark: 'github-dark',
          },
          defaultColor: false,
        },
      },
    });
    ```



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hulk510 / playground

fix(deps): update dependency astro to v4.12.0 #723

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