fix(deps): update dependency astro to v7 [SECURITY] (#674)

* fix(deps): update dependency astro to v7 [SECURITY]

* fix(deps): bump @astrojs/starlight to v0.41.3 for astro v7 compat

The astro v7 security update (GHSA-4g3v-8h47-v7g6) broke Docs Build
because @astrojs/starlight@^0.39.0 bundles @astrojs/mdx@^5.0.4, which
imports an astro subpath (./jsx/rehype.js) removed from astro v7's
package.json exports map.

Starlight 0.41.3 requires astro@^7.0.2 and bundles @astrojs/mdx@^7.0.0,
resolving the incompatibility. Regenerated bun.lock from a clean
install to also drop a stale hoisted @astrojs/markdown-remark@7.1.2
entry that caused a separate 'unified is not a function' failure
during Astro's legacy markdown-plugin config coercion.

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Co-authored-by: mrbro-bot[bot] <137683033+mrbro-bot[bot]@users.noreply.github.com>
Co-authored-by: fro-bot <80104189+fro-bot@users.noreply.github.com>

Author: mrbro-bot[bot]