chore(deps): update linting dependencies

[MikeMcC399]

Situation

npm audit reports a low severity vulnerability with brace-expansion

Change

Although the vulnerability can be fixed with npm audit fix, take the opportunity to refresh the linting dependencies.

• Update each dependency as follows, and convert to use semver definitions for markdown-link-check and prettier

Package	Current	Update to
@stylistic/eslint-plugin	4.2.0	5.1.0
eslint	9.22.0	9.30.1
eslint-plugin-cypress	4.2.0	5.1.0
globals	16.0.0	16.3.0
markdown-link-check	3.12.2	3.13.7
prettier	3.5.3	3.6.2

• Convert from using the deprecated eslint-plugin-cypress/flat to the equivalent eslint-plugin-cypress configuration

• Accept minor formatting change to the CONTRIBUTING document, enforce suggested by Prettier.

Verify

npm ci
npm audit
npm run lint
npm run format:check
npm run check:markdown

Confirm that

• no vulnerabilities are reported
• all linting succeeds, with no changes suggested

[cypress-app-bot]

• Create a Draft Pull Request if your PR is not ready for review. Mark the PR as Ready for Review when you're ready for a Cypress team member to review the PR.