security/rubygem-lockbox: update to 0.6.8
Changelog:
https://github.com/ankane/lockbox/blob/master/CHANGELOG.md
0.6.8 (2022-01-25)
Fixed issue with encrypts loading model schema early Removed warning for attributes with default option
0.6.7 (2022-01-25)
Added warning for attributes with default option Removed warning for Active Record 5.0 (still supported)
0.6.6 (2021-09-27)
Fixed attribute? method for boolean and integer types
0.6.5 (2021-07-07)
Fixed issue with pluck extension not loading in some cases