tests(deps): add node.js 24 (current) support

[MikeMcC399]

Situation

Node.js 24.0.0 was released on May 6, 2025.

Change

This PR adds Node.js 24:

• to the matrix of tested nodes under .github/workflows/example-node-versions.yml
• to the README > Example section
• to the README > Node.js > Support section

Comments

• Since there is no change to the action itself, and the additional support of Node.js 24.x is an extension, there is no version change of the action

• According to Node.js release schedule plans, Node.js 24.x changes from "Current" status to "LTS" status on Oct 28, 2025.

[cypress-app-bot]

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