Bump diffy from 3.4.0 to 3.4.2

Bumps [diffy](https://github.com/samg/diffy) from 3.4.0 to 3.4.2.
- [Release notes](https://github.com/samg/diffy/releases)
- [Changelog](https://github.com/samg/diffy/blob/main/CHANGELOG)
- [Commits](https://github.com/samg/diffy/commits)

---
updated-dependencies:
- dependency-name: diffy
  dependency-type: indirect
...

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

Gemfile.lock

@@ -450,7 +450,7 @@ GEM
       actionmailer (>= 4.1.0)
       devise (>= 4.0.0)
     diff-lcs (1.5.0)
-    diffy (3.4.0)
+    diffy (3.4.2)
     doc2text (0.4.4)
       nokogiri (>= 1.12.5, < 1.13.0)
       rubyzip (~> 2.3.0)