[Snyk] Security upgrade pa11y from 8.0.0 to 9.0.0

[JJediny]

Snyk has created this PR to fix 1 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
	Arbitrary Code Injection SNYK-JS-JSONPATH-13645034	853

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[Copilot]

Pull request overview

This PR upgrades the pa11y dependency to remediate a Snyk-reported vulnerability in the project’s npm dependency tree.

Changes:

• Bump pa11y from ^8.0.0 to ^9.0.0 in package.json
• Refresh package-lock.json to reflect updated pa11y and its transitive dependency updates (notably newer puppeteer)

Reviewed changes

Copilot reviewed 1 out of 2 changed files in this pull request and generated 1 comment.

File	Description
package.json	Updates pa11y to v9 to address the flagged vulnerability.
package-lock.json	Updates resolved dependency graph for pa11y v9 (including updated transitive packages).

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[Copilot]

Upgrading pa11y to v9 pulls in a much newer puppeteer (and a Chromium download during install). Since the project still uses pa11y-ci for npm run accessibility:pa11y, this results in two separate puppeteer trees (and two browser downloads). Consider either removing the direct pa11y dependency if it isn’t used, or upgrading/replacing pa11y-ci to a version compatible with pa11y v9 so only one puppeteer is installed.