Log Message:
security/ruby-bcrypt: update to 3.1.18

3.1.17 (2022-05-14)

* Unlock GVL when calculating hashes and salts [GH #260]
* Fix compilation warnings in `ext/mri/bcrypt_ext.c` [GH #261]

3.1.18 (2022-05-16)

* Fix regex in validators to use \A and \z instead of ^ and $ [GH #121]
* Truncate secrets greater than 72 bytes in hash_secret [GH #255]
* Assorted test and doc improvements