Allows rails 7 with minor versions

[aYaremchuk]

Rails 7.1.3 incompatible

Could not find compatible versions

Because every version of crypt_keeper depends on activerecord >= 7.0.0, < 7.1.A
  and rails >= 7.1.3 depends on activerecord = 7.1.3,
  every version of crypt_keeper is incompatible with rails >= 7.1.3.
So, because Gemfile depends on rails = 7.1.3
  and Gemfile depends on crypt_keeper >= 0,
  version solving has failed.

Added minor change to support minor versions of rails 7 Also changed path version of gem