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: direct:production
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -128,7 +128,7 @@ GEM
       rubocop (~> 1.0)
     declarative (0.0.20)
     diff-lcs (1.4.4)
-    diffy (3.4.0)
+    diffy (3.4.2)
     digest-crc (0.6.4)
       rake (>= 12.0.0, < 14.0.0)
     docile (1.4.0)
@@ -271,6 +271,7 @@ GEM
     method_source (0.9.2)
     mini_magick (4.11.0)
     mini_mime (1.1.2)
+    mini_portile2 (2.8.0)
     minitest (5.14.4)
     molinillo (0.8.0)
     multi_json (1.15.0)
@@ -280,7 +281,8 @@ GEM
     naturally (2.2.1)
     netrc (0.11.0)
     no_proxy_fix (0.1.2)
-    nokogiri (1.13.3-x86_64-darwin)
+    nokogiri (1.13.3)
+      mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     octokit (4.21.0)
       faraday (>= 0.9)