🔧 Set minimum Ruby to v2.0

[pboling]

• based on dependency "net-ldap", "~> 0.16"
• switches from rubocop-lts v0 => v4
• switches from rubocop-ruby-1_8 => rubocop-ruby2_0

[Copilot]

Pull Request Overview

This PR modernizes Ruby hash syntax throughout the codebase by converting the older hash rocket syntax (:key => value) to the modern Ruby 1.9+ syntax (key: value). Additionally, it updates documentation and comments to accurately reflect that nkf was changed to a bundled gem (not removed) in Ruby 3.4, updates the minimum required Ruby version from 0 to 2.0, and upgrades rubocop-lts tooling.

Key changes:

• Converted hash syntax from :key => value to key: value across production code, specs, gemfiles, and configuration files
• Updated minimum Ruby version requirement from >= 0 to >= 2.0 in gemspec
• Corrected technical inaccuracy: nkf was "changed to a bundled gem" (not "removed") in Ruby 3.4
• Updated rubocop-lts dependencies and version constraints

Reviewed Changes

Copilot reviewed 36 out of 38 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
spec/spec_helper.rb	Updated hash syntax in RSpec configuration
spec/omniauth/strategies/ldap_spec.rb	Modernized hash syntax in LDAP strategy tests
spec/omniauth-ldap/adaptor_spec.rb	Updated hash syntax in adaptor tests
omniauth-ldap.gemspec	Changed minimum Ruby version to 2.0 and corrected nkf documentation
lib/omniauth/strategies/ldap.rb	Modernized hash syntax in LDAP strategy implementation
lib/omniauth-ldap/adaptor.rb	Updated hash syntax in adaptor and corrected nkf comment
gemfiles/*.gemfile	Converted hash syntax in all gemfile configurations
gemfiles/modular/style.gemfile	Updated rubocop dependencies and hash syntax
README.md	Updated documentation with modern hash syntax, corrected Ruby version info, and added Ruby 3.4 section
Guardfile	Updated hash syntax in Guard configuration
Gemfile.lock	Updated rubocop-lts dependencies from v0.1 to v4.0
.yard_gfm_support.rb	Modernized hash syntax in YARD configuration
.rubocop_gradual.lock	Updated gradual linting lock file checksums

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