[Snyk] Security upgrade astro from 4.16.19 to 5.15.9

[RealSollyM]

Snyk has created this PR to fix 5 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Directory Traversal SNYK-JS-ASTRO-14059661	738
	Cross-site Scripting (XSS) SNYK-JS-ASTRO-14059122	708
	Relative Path Traversal SNYK-JS-ASTRO-14059139	648
	Relative Path Traversal SNYK-JS-ASTROJSINTERNALHELPERS-14059142	648
	Cross-site Scripting (XSS) SNYK-JS-ASTROJSINTERNALHELPERS-14059660	648

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• Max score is 1000. Note that the real score may have changed since the PR was raised.
• This PR was automatically created by Snyk using the credentials of a real user.

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Learn how to fix vulnerabilities with free interactive lessons:

🦉 Cross-site Scripting (XSS)
🦉 Relative Path Traversal

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