Bump bcrypt from 3.1.18 to 3.1.19

Bumps [bcrypt](https://github.com/codahale/bcrypt-ruby) from 3.1.18 to 3.1.19.
- [Release notes](https://github.com/codahale/bcrypt-ruby/releases)
- [Changelog](https://github.com/bcrypt-ruby/bcrypt-ruby/blob/master/CHANGELOG)
- [Commits](bcrypt-ruby/bcrypt-ruby@v3.1.18...v3.1.19)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -36,7 +36,7 @@ GEM
       bundler
       rake
       thor (>= 0.14.0)
-    bcrypt (3.1.18)
+    bcrypt (3.1.19)
     builder (3.2.4)
     coderay (1.1.3)
     concurrent-ruby (1.1.10)