[CI] GH actions warning: EBADENGINE Unsupported engine

[chalin]

For example, see https://github.com/open-telemetry/opentelemetry.io/actions/runs/8521850126/job/23340822107?pr=4232:

npm WARN EBADENGINE Unsupported engine {
npm WARN EBADENGINE   package: undefined,
npm WARN EBADENGINE   required: { node: '20.x' },
npm WARN EBADENGINE   current: { node: 'v18.19.1', npm: '10.2.4' }
npm WARN EBADENGINE }

These warnings only appear when the check-text workflow jobs are run.