Bump diff-lcs from 1.3 to 1.4.3 (mastodon#14186)

Bumps [diff-lcs](https://github.com/halostatue/diff-lcs) from 1.3 to 1.4.3.
- [Release notes](https://github.com/halostatue/diff-lcs/releases)
- [Changelog](https://github.com/halostatue/diff-lcs/blob/master/History.md)
- [Commits](halostatue/diff-lcs@v1.3...v1.4.3)

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

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

Gemfile.lock

@@ -188,7 +188,7 @@ GEM
     devise_pam_authenticatable2 (9.2.0)
       devise (>= 4.0.0)
       rpam2 (~> 4.0)
-    diff-lcs (1.3)
+    diff-lcs (1.4.3)
     discard (1.2.0)
       activerecord (>= 4.2, < 7)
     docile (1.3.2)