business issues

Document `next_business_day` and `previous_business_day` in the README

`#next_business_day` and `#previous_business_day` are useful public methods of `Business::Calendar`: https://github.com/gocardless/business/blob/936546b2ef5ee132e1e4dd7ad9a42c521afd2e43/lib/business/calendar.rb#L106-L122 The [README’s “Business day arithmetic” section](https://github.com/gocardless/business/blob/master/README.md#business-day-arithmetic) does not document those methods. It should. Where I think this documentation belongs in...

roryokane

Update rubocop requirement from ~> 1.48.1 to ~> 1.63.3

Updates the requirements on [rubocop](https://github.com/rubocop/rubocop) to permit the latest version. Changelog Sourced from rubocop's changelog. 1.63.3 (2024-04-22) Bug fixes #12857: Fix false negatives for Lint/UnreachableCode when using pattern matching. ([@koic][])...

dependabot[bot]