Bump bcrypt from 3.1.19 to 3.1.20 (#3827)

Bumps [bcrypt](https://github.com/codahale/bcrypt-ruby) from 3.1.19 to 3.1.20.
- [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@v3.1.19...v3.1.20)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -174,7 +174,7 @@ GEM
       descendants_tracker (~> 0.0.4)
       ice_nine (~> 0.11.0)
       thread_safe (~> 0.3, >= 0.3.1)
-    bcrypt (3.1.19)
+    bcrypt (3.1.20)
     bcrypt_pbkdf (1.1.0)
     bindex (0.8.1)
     bootsnap (1.17.0)