Allow users of bitstyles to run node 22

[angelikatyborska]

This library delivers CSS only and doesn't need to require its users to run a specific version of node.

This change should remove the warning you would see when using node 22 and installing this library:

npm warn EBADENGINE Unsupported engine {
npm warn EBADENGINE   package: '[email protected]',
npm warn EBADENGINE   required: { node: '^18.16.0', npm: '^9.5.1' },
npm warn EBADENGINE   current: { node: 'v22.4.0', npm: '10.8.1' }
npm warn EBADENGINE }

[planktonic]

Thanks!