Update diff-lcs requirement from ~> 1.6 to >= 1.6, < 3.0

[dependabot]

Updates the requirements on diff-lcs to permit the latest version.

Changelog

Sourced from diff-lcs's changelog.

1.6.2 / 2025-05-12

• Handle upcoming changes to the cgi gem in Ruby 3.5 (#147[pull-147])

• Fix issues found with htmldiff in Ruby 1.8 (which is used approximately never, since the code change which broke Ruby 1.8 was made 6 years ago). #148[pull-148]

• Fixed some standardrb formatting and configuration issues.

1.6.1 / 2025-03-25

• Performed further work on Diff::LCS::Ldiff improvements (#46[issue-46]) and resolve several thread safety issues cleanly by making it a class. #129[pull-129]

• Restructure the project to be more consistent with the rest of the projects that I manage.

• Increased GitHub action security.

• Added [trusted publishing][tp] for fully automated releases.

1.6.0 / 2025-02-13

• Baptiste Courtois ([@​annih][gh-user-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[pull-103]. This partially resolves #46[issue-46].

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

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

• Patrick Linnane fixed various minor typos. #93[pull-93]

• Mark Young added a Changelog link to the RubyGems metadata. #92[pull-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[issue-70].

... (truncated)

Commits

• aca4bd7 Bump actions/dependency-review-action from 4.6.0 to 4.7.0
• a56cd23 Update gemspec for 1.6.2
• f5e9ac5 chore: Fix Ruby 1.8 and formatting issues
• 2d7411f Update changelog
• d1b5380 Replace usage of cgi gem for Ruby 3.5
• 6b7ed57 Bump ruby/setup-ruby from 1.235.0 to 1.237.0
• 1d8235d Bump astral-sh/setup-uv from 6.0.0 to 6.0.1
• 6bad0c9 Bump github/codeql-action from 3.28.16 to 3.28.17
• 1996222 Bump github/codeql-action from 3.28.15 to 3.28.16
• 210d1e7 Bump ruby/setup-ruby from 1.233.0 to 1.235.0
• Additional commits viewable in compare view

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[github-actions]

Simplecov Report

Covered	Threshold
98.51%	90%

[sanjain-progress]

unable to merge this PR right now because Chef uses "diff-lcs", "~> 1.6.0" in its gemspec:
https://github.com/chef/chef/blob/main/chef.gemspec#L67C21-L67C29