Bump bcrypt from 3.1.20 to 3.1.21 (#445)

Bumps [bcrypt](https://github.com/bcrypt-ruby/bcrypt-ruby) from 3.1.20 to 3.1.21.
- [Release notes](https://github.com/bcrypt-ruby/bcrypt-ruby/releases)
- [Changelog](https://github.com/bcrypt-ruby/bcrypt-ruby/blob/master/CHANGELOG)
- [Commits](bcrypt-ruby/bcrypt-ruby@v3.1.20...v3.1.21)

---
updated-dependencies:
- dependency-name: bcrypt
  dependency-version: 3.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -31,7 +31,7 @@ GEM
     api-pagination (6.0.0)
     ast (2.4.3)
     base64 (0.3.0)
-    bcrypt (3.1.20)
+    bcrypt (3.1.21)
     bigdecimal (3.3.1)
     builder (3.3.0)
     bundler-audit (0.9.3)