Bump bcrypt from 3.1.17 to 3.1.18

Bumps [bcrypt](https://github.com/codahale/bcrypt-ruby) from 3.1.17 to 3.1.18.
- [Release notes](https://github.com/codahale/bcrypt-ruby/releases)
- [Changelog](https://github.com/bcrypt-ruby/bcrypt-ruby/blob/master/CHANGELOG)
- [Commits](https://github.com/codahale/bcrypt-ruby/commits)

---
updated-dependencies:
- dependency-name: bcrypt
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -301,7 +301,7 @@ GEM
       aws-sigv4 (~> 1.1)
     aws-sigv4 (1.5.0)
       aws-eventstream (~> 1, >= 1.0.2)
-    bcrypt (3.1.17)
+    bcrypt (3.1.18)
     bindata (2.4.10)
     binding_of_caller (1.0.0)
       debug_inspector (>= 0.0.1)