Bump shoulda-matchers from 6.3.0 to 6.4.0

Bumps [shoulda-matchers](https://github.com/thoughtbot/shoulda-matchers) from 6.3.0 to 6.4.0.
- [Release notes](https://github.com/thoughtbot/shoulda-matchers/releases)
- [Changelog](https://github.com/thoughtbot/shoulda-matchers/blob/main/CHANGELOG.md)
- [Commits](thoughtbot/shoulda-matchers@v6.3.0...v6.4.0)

---
updated-dependencies:
- dependency-name: shoulda-matchers
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -543,7 +543,7 @@ GEM
     sentry-ruby (5.19.0)
       bigdecimal
       concurrent-ruby (~> 1.0, >= 1.0.2)
-    shoulda-matchers (6.3.0)
+    shoulda-matchers (6.4.0)
       activesupport (>= 5.2.0)
     silencer (2.0.0)
     simplecov (0.22.0)