chai v5 support

[justin-mellor]

Chai v5 was released in December 2023. It would be great if chai-datetime could be compatible.

Currently if you upgrade chai to v5 you get

TypeError: Cannot read properties of undefined (reading 'use')

chai.use(chaiDate);

I have a simple repro in
https://github.com/justin-mellor/chai-datetime-chai5

[mguterl]

Thanks for the report! I'm not actively using chai, but I may take a look at what it will take to support the new API.