Restore Ruby 2.3 Caboose tooling

Author: pboling

.rubocop_gradual.lock

@@ -44,10 +44,10 @@
     [571, 48, 1, "Style/TrailingCommaInArguments: Avoid comma after the last parameter of a method call.", 177545],
     [573, 21, 1, "Style/TrailingCommaInArguments: Avoid comma after the last parameter of a method call.", 177545]
   ],
-  "oauth2.gemspec:2324570894": [
+  "oauth2.gemspec:3554116155": [
     [81, 5, 36, "Style/TrailingCommaInArrayLiteral: Put a comma after the last item of a multiline array.", 3227795012],
     [106, 5, 9, "Style/TrailingCommaInArrayLiteral: Put a comma after the last item of a multiline array.", 1146747705],
-    [178, 3, 68, "Gemspec/OrderedDependencies: Dependencies should be sorted in an alphabetical order within their section of the gemspec. Dependency `backports` should appear before `rexml`.", 4213155631]
+    [186, 3, 68, "Gemspec/OrderedDependencies: Dependencies should be sorted in an alphabetical order within their section of the gemspec. Dependency `backports` should appear before `rexml`.", 4213155631]
   ],
   "spec/examples/google_spec.rb:2278649676": [
     [17, 35, 1, "Style/TrailingCommaInArguments: Avoid comma after the last parameter of a method call.", 177545]

CHANGELOG.md

@@ -29,6 +29,7 @@ Please file a bug if you notice a violation of semantic versioning.
 ### Fixed
 
 - Updated CI workflow maintenance: QLTY uploads now use OIDC, harden-runner is pinned to v2.19.4, and Caboose dependency installation logs are visible on failure.
+- Restored Ruby 2.3 Caboose CI bundle resolution by using the last compatible kettle development/test toolchain on that EOL runtime.
 - Replaced stale platform CI `rake magic` commands with portable spec commands.
 - Pinned `multi_xml` below 0.9 for TruffleRuby compatibility.
 - Marked EOL TruffleRuby 22.3, 23.0, and 23.1 CI as experimental because they can crash inside the interpreter during Bundler setup.

docs/file.CHANGELOG.html

@@ -84,6 +84,7 @@ <h3 id="fixed">Fixed</h3>
 
 <ul>
   <li>Updated CI workflow maintenance: QLTY uploads now use OIDC, harden-runner is pinned to v2.19.4, and Caboose dependency installation logs are visible on failure.</li>
+  <li>Restored Ruby 2.3 Caboose CI bundle resolution by using the last compatible kettle development/test toolchain on that EOL runtime.</li>
   <li>Replaced stale platform CI <code>rake magic</code> commands with portable spec commands.</li>
   <li>Pinned <code>multi_xml</code> below 0.9 for TruffleRuby compatibility.</li>
   <li>Marked EOL TruffleRuby 22.3, 23.0, and 23.1 CI as experimental because they can crash inside the interpreter during Bundler setup.</li>
@@ -1405,7 +1406,7 @@ <h2 id="001---2010-04-22">
 </div></div>
 
       <div id="footer">
-  Generated on Wed Jun  3 19:00:56 2026 by
+  Generated on Wed Jun  3 19:07:25 2026 by
   <a href="https://yardoc.org" title="Yay! A Ruby Documentation Tool" target="_parent">yard</a>
   0.9.44 (ruby-4.0.4).
 </div>

oauth2.gemspec

@@ -125,7 +125,7 @@ Gem::Specification.new do |spec|
   #       However, development dependencies in gemspec will install on
   #       all versions of Ruby that will run in CI.
   #       This gem, and its gemspec runtime dependencies, will install on Ruby down to 2.2.0.
-  #       This gem, and its gemspec development dependencies, will install on Ruby down to 2.4.
+  #       This gem, and its standard gemspec development dependencies, will install on Ruby down to 2.4.
   #       Thus, dev dependencies in gemspec must have
   #
   #       required_ruby_version ">= 2.4" (or lower)
@@ -134,7 +134,11 @@ Gem::Specification.new do |spec|
   #       and preferably a modular one (see gemfiles/modular/*.gemfile).
 
   # Dev, Test, & Release Tasks
-  spec.add_development_dependency("kettle-dev", "~> 2.0", ">= 2.0.8")      # ruby >= 2.4
+  if Gem.ruby_version < Gem::Version.new("2.4")
+    spec.add_development_dependency("kettle-dev", "~> 2.0", "= 2.0.0")              # ruby >= 2.3.0
+  else
+    spec.add_development_dependency("kettle-dev", "~> 2.0", ">= 2.0.8")            # ruby >= 2.4.0
+  end
 
   # Security
   spec.add_development_dependency("bundler-audit", "~> 0.9.3")                      # ruby >= 2.0.0
@@ -147,8 +151,12 @@ Gem::Specification.new do |spec|
 
   # Testing
   spec.add_development_dependency("appraisal2", "~> 3.0", ">= 3.0.6")               # ruby >= 1.8.7, for testing against multiple versions of dependencies
-  spec.add_development_dependency("kettle-test", "~> 2.0", ">= 2.0.3")             # ruby >= 2.4
-  spec.add_development_dependency("turbo_tests2", "~> 3.1", ">= 3.1.1")            # ruby >= 2.4.0, default kettle-test runner
+  if Gem.ruby_version < Gem::Version.new("2.4")
+    spec.add_development_dependency("kettle-test", "~> 1.0", ">= 1.0.10")          # ruby >= 2.3.0
+  else
+    spec.add_development_dependency("kettle-test", "~> 2.0", ">= 2.0.3")           # ruby >= 2.4.0
+    spec.add_development_dependency("turbo_tests2", "~> 3.1", ">= 3.1.1")          # ruby >= 2.4.0, default kettle-test runner
+  end
 
   # Releasing
   spec.add_development_dependency("ruby-progressbar", "~> 1.13")                    # ruby >= 0