fix: xml root element, root arrays and allOf composition - #223

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683, actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

test/integration.spec.js:748:9: Do not add `then` to an object.

test/integration.spec.js:611:9: Do not add `then` to an object.

src/samplers/string.js:14:30: Parameter 'max' is declared but never used. Unused parameters should start with a '_'.

test/unit/string.spec.js:7:116: Unnecessary escape character '-'

test/unit/string.spec.js:7:62: Unnecessary escape character '-'

src/samplers/string-regex.js:328:36: Unnecessary escape character ','

src/samplers/string-regex.js:220:37: Unnecessary escape character ','

src/samplers/string-regex.js:198:33: Unnecessary escape character ','

src/samplers/boolean.js:1:31: Parameter 'schema' is declared but never used. Unused parameters should start with a '_'.