Bump shoulda-matchers from 6.3.0 to 6.3.1

Bumps [shoulda-matchers](https://github.com/thoughtbot/shoulda-matchers) from 6.3.0 to 6.3.1.
- [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...v6.3.1)

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

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

Gemfile.lock

@@ -224,7 +224,7 @@ GEM
       rubocop-ast (>= 1.31.1, < 2.0)
     ruby-progressbar (1.13.0)
     securerandom (0.3.1)
-    shoulda-matchers (6.3.0)
+    shoulda-matchers (6.3.1)
       activesupport (>= 5.2.0)
     stringio (3.1.1)
     strscan (3.1.0)