Some others have had situations like this and some have had luck by just right-clicking the plugin file and clicking "Open" at least once. Try some of these solutions!
https://support.apple.com/lv-lv/guide/mac-help/mh40616/mac
https://github.com/hashicorp/terraform/issues/23033#issuecomment-539736692
https://community.vcvrack.com/t/rack-cant-be-opened-because-apple-cant-check-it-...