chore: bump astro v6

[bjohansebas]

No description provided.

[netlify]

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Lighthouse	1 paths audited Performance: 99 (🟢 up 3 from production) Accessibility: 100 (🟢 up 13 from production) Best Practices: 100 (no change from production) SEO: 100 (🟢 up 6 from production) PWA: 80 (🟢 up 50 from production) View the detailed breakdown and full score reports

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[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	npm/​eslint-plugin-markdown@​2.2.1
	npm/​eslint@​8.57.0
	npm/​@​astrojs/​sitemap@​3.7.1 ⏵ 3.7.2	+1		+1	+3
	npm/​eslint-plugin-promise@​6.6.0
	npm/​@​astrojs/​react@​4.4.2 ⏵ 5.0.2			+1	+2
	npm/​@​astrojs/​mdx@​4.3.13 ⏵ 5.0.3			+1	+1
	npm/​eslint-plugin-import@​2.32.0
	npm/​eslint-config-standard@​17.1.0
	npm/​astro@​5.18.0 ⏵ 6.1.2	+1	+1	+1
	npm/​eslint-plugin-n@​15.7.0
	npm/​@​astrojs/​rss@​4.0.17 ⏵ 4.0.18				+1

View full report