Bump diffy from 3.4.0 to 3.4.2 (#1313)

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: direct:development
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -96,7 +96,7 @@ GEM
       no_proxy_fix
       octokit (~> 4.7)
       terminal-table (>= 1, < 4)
-    diffy (3.4.0)
+    diffy (3.4.2)
     escape (0.0.4)
     ethon (0.15.0)
       ffi (>= 1.15.0)