feat(deps): remove Node.js 25

[MikeMcC399]

Situation

Node.js 25.x transitioned into End-of-life status on June 1, 2026.

Change

This PR removes Node.js 25:

• 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.

docs/MAINTENANCE.md is also modified to note that Corepack is not packaged in Node.js >=25.

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
Documentation and example workflow matrix changes only; no changes to action runtime or security-sensitive code.

Overview
Drops Node.js 25 from supported/tested versions now that 25.x is end-of-life. CI matrix in example-node-versions.yml and README example workflows no longer include 25; the Node.js > Support section lists 22.x, 24.x, and 26.x only. CHANGELOG records this under v7.4.0.

docs/MAINTENANCE.md clarifies that corepack ships with Node.js ≤24 (for Yarn Modern examples) and may need npm install -g corepack on Node.js >24.

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