docs: update example versions

[MikeMcC399]

Situation

Cypress versions and browser versions used in text examples in README and CONTRIBUTING documents are outdated.

Cypress 13 references are made, where the current version is Cypress 15.

Cypress officially supports the latest 3 major versions of Chrome, Firefox, and Edge and so it is better to ensure that any examples show browser versions within the supported range. This means currently:

• Chrome 140, 139, 138
• Edge 139, 138, 137
• Firefox 142, 141, 140

Change

Considering current releases, update versions used in documentation:

Component	Current major release	Release example
Cypress	15	15.1.0
Geckodriver	0	0.36.0
Google Chrome	139	139.0.7258.154
Microsoft Edge	139	139.0.3405.125
Mozilla Firefox	142	142.0.1
Node.js	22 (Active LTS)	22.19.0
Node.js	20 (Maintenance LTS)	20.19.4
cypress/factory	6	6.0.1
cypress/base		22.19.0
cypress/browsers (short)		22.19.0
cypress/browsers (long)		node-22.19.0-chrome-139.0.7258.154-1-ff-142.0.1-edge-139.0.3405.125-1
cypress/included (short)		15.1.0
cypress/included (long)		cypress-15.1.0-node-22.19.0-chrome-139.0.7258.154-1-ff-142.0.1-edge-139.0.3405.125-1

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