Bump shoulda-matchers from 6.0.0 to 6.1.0

Bumps [shoulda-matchers](https://github.com/thoughtbot/shoulda-matchers) from 6.0.0 to 6.1.0.
- [Release notes](https://github.com/thoughtbot/shoulda-matchers/releases)
- [Changelog](https://github.com/thoughtbot/shoulda-matchers/blob/main/CHANGELOG.md)
- [Commits](https://github.com/thoughtbot/shoulda-matchers/compare/v6.0.0...v6.1.0)

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

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

Gemfile.lock

@@ -93,7 +93,7 @@ GEM
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
       rouge (>= 1.0.0)
-    bigdecimal (3.1.5)
+    bigdecimal (3.1.6)
     bindex (0.8.1)
     binding_of_caller (1.0.0)
       debug_inspector (>= 0.0.1)
@@ -247,7 +247,7 @@ GEM
     mini_magick (4.12.0)
     mini_mime (1.1.5)
     mini_portile2 (2.8.5)
-    minitest (5.21.1)
+    minitest (5.21.2)
     mnemosyne-ruby (1.17.0)
       activesupport (>= 4)
       bunny
@@ -474,7 +474,7 @@ GEM
       rack-proxy (>= 0.6.1)
       railties (>= 5.2)
       semantic_range (>= 2.3.0)
-    shoulda-matchers (6.0.0)
+    shoulda-matchers (6.1.0)
       activesupport (>= 5.2.0)
     simplecov (0.22.0)
       docile (~> 1.1)