Bump paper_trail from 14.0.0 to 15.0.0

Bumps [paper_trail](https://github.com/airblade/paper_trail) from 14.0.0 to 15.0.0.
- [Release notes](https://github.com/airblade/paper_trail/releases)
- [Changelog](https://github.com/paper-trail-gem/paper_trail/blob/master/CHANGELOG.md)
- [Commits](paper-trail-gem/paper_trail@v14.0.0...v15.0.0)

---
updated-dependencies:
- dependency-name: paper_trail
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Gemfile.lock

@@ -169,8 +169,8 @@ GEM
     nokogiri (1.15.3-x86_64-darwin)
       racc (~> 1.4)
     orm_adapter (0.5.0)
-    paper_trail (14.0.0)
-      activerecord (>= 6.0)
+    paper_trail (15.0.0)
+      activerecord (>= 6.1)
       request_store (~> 1.4)
     parallel (1.23.0)
     parser (3.2.2.3)