Log Message:
textproc/ruby-diff-lcs: update to 1.6.0

1.6.0 (2025-02-13)

* Baptiste Courtois (@annih) has done significant work on making bin/ldiff
  work better, contributing a number of issues and pull requests.  These
  include:

    - Separation of command parsing from diff-generation in Diff::LCS::Ldiff
      code extraction making it easier to use separately from the bin/ldiff
      command in #103.  This partially resolves #46.

    - Improvement of binary and empty file detection and tests in #104 and
      #105.  This resolves issues #100, #102.

    - Various ldiff fixes for output #101 resolves issues #106 (ldiff ed
      scripts are inverted), #107 (ldiff hunk ranges are incorrect;
      regression or incorrect fix for #60), and #95.

* Patrick Linnane fixed various minor typos. #93

* Mark Young added a Changelog link to the RubyGems metadata.  #92 This has
  been modified to incorporate it into the README.

* Updated the documentation on Diff::LCS#lcs to be clearer about the
  requirements for object equality comparison.  This resolves #70.

* Governance:

  Changes described here are effective 2024-12-31.

    - Update gem management details to use markdown files for everything,
      enabled in part by flavorjones/hoe-markdown.  Several files were
      renamed to be more consistent with standard practices.

    - Updated security notes with an age public key rather than pointing to
      Keybase.io and a PGP public key which I no longer use.  The use of the
      Tidelift security contact is recommended over direct disclosure.