Fix issue #283: Rename Key Group to Entity Set

[tientong98]

Closes #283. <-- Taylor: put the issue you're addressing here so merging the PR will close the issue

Changes proposed in this pull request

• Use re to change all instances of Key Group to Entity Set (matching capitalization and delimiter) across all files that can be decoded using UTF-8.
• Update to Ubuntu 2404:2024.08.1 and bids-validator@1.14.14-dev.0 to pass CircleCI test (from 1.14.9 to 1.14.13, there is an issue with JSON schema validation), change build_validator_call func in cubids/validator.py to follow the new syntax (require this version somewhere in the doc?)

[tientong98]

Hi @tsalo and @mattcieslak - circleci failed because it used ubuntu-2004:202201-02, which is now deprecated and not available . I want to change the config.yml file so that it uses one of the current images, but I'm not sure if it will break anything else. Do you have any preference on which image to use?

[mattcieslak]

Any of those should be ok