feat(deps): remove Node.js 20

[MikeMcC399]

Situation

Node.js 20.x transitioned into End-of-life status on April 30, 2026.

Change

This PR removes Node.js 20:

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

and adds the change to the CHANGELOG.

Comments

• Although there is no change to the action itself, this PR triggers a minor version release in order to republish the README to the npm registry for reference. It also provides a release milestone for reference in the CHANGELOG.

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Note

Low Risk
Low risk documentation/CI example update only; no runtime action code changes. Main impact is dropping Node 20 from the tested/example matrices, which could affect users still relying on that version in copied workflows.

Overview
Removes Node.js 20 from all documented/tested example matrices (workflow example-node-versions.yml and multiple README snippets) and updates the README Node.js Support section to list only 22/24/25.

Adds a CHANGELOG.md entry for v7.2.0 noting the Node 20 removal, and tweaks related docs links/wording around Node 20 deprecation/EOL.

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[MikeMcC399]

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