Log Message:
textproc/ruby-diff-lcs: update to 1.5.1

1.5.1 (2024-01-31)

* Peter Goldstein updated CI configuration to add Ruby 3.1 and Masato
  Nakamura added Ruby 3.2 and 3.3. #82, #89
* Updated the CI configuration, resolving #82 to add Ruby 3.1. Masato
* Switched to standard ruby formatting.
* Justin Steele converted the licence file to Markdown. #84
* Updated the gem SPDX identifier for GPL 2.0 or later, resolving #86 by Vit
  Ondruch.
* Resolve a potential security issue with ldiff in its use of IO.read
  instead of File.read. #91
* Added MFA authentication requirement for release to RubyGems. #90
* Added dependabot management for actions and gems. #90
* Updated CodeQL coniguration. #90