[Snyk] Security upgrade next from 15.5.12 to 15.5.21

[peterj]

Snyk has created this PR to fix 2 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• package.json
• package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Server-side Request Forgery (SSRF) SNYK-JS-NEXT-18233136	701
	Server-side Request Forgery (SSRF) SNYK-JS-NEXT-18233752	701

Breaking Change Risk

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🦉 Server-side Request Forgery (SSRF)

[peterj]

This is a patch-level upgrade that moves from 15.5.12 to 15.5.21. According to the official Next.js announcements, version 15.5.21 is a security release that addresses multiple high and medium severity vulnerabilities.

As a patch release, it contains bug fixes and security patches and does not introduce any breaking API changes. An upgrade is highly recommended to ensure the application is secure.

Source: Next.js Blog

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