Bump kettle-dev template floor to 2.3.7

[pboling]

Summary

• update generated gemspec templates to require kettle-dev >= 2.3.7
• update generated monorepo root Gemfile dependency source for kettle-dev >= 2.3.7
• refresh focused thin-slice expectations and changelog note

Verification

• git diff --check
• K_SOUP_COV_DO=false bundle exec kettle-test spec/thin_slice_spec.rb:9840 spec/thin_slice_spec.rb:9924 spec/thin_slice_spec.rb:9983

Note: bin/rake spec:dependency_floors is mentioned in the changelog but was removed previously, so mentions have been removed here. bin/rake rubocop_gradual:autocorrect made no changes and still reports pre-existing kettle-jem.gemspec work-list entries.

[Copilot]

Pull request overview

This PR raises the minimum (>=) kettle-dev version used by kettle-jem’s generated gemspec templates and updates the generated monorepo-root Gemfile dependency line to match, aligning the thin-slice expectations and changelog entry with the new floor.

Changes:

• Bumped generated gemspec template development dependency floor from kettle-dev >= 2.3.6 to >= 2.3.7.
• Updated the monorepo root Gemfile dependency source line to kettle-dev >= 2.3.7.
• Refreshed thin-slice expectations and updated the changelog note to reflect the new minimum.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
gems/kettle-jem/spec/thin_slice_spec.rb	Updates thin-slice expected gemspec content to require kettle-dev >= 2.3.7.
gems/kettle-jem/lib/kettle/jem/templates/shim/gem.gemspec.example	Raises the generated shim gemspec template’s kettle-dev minimum to 2.3.7.
gems/kettle-jem/lib/kettle/jem/templates/gem.gemspec.example	Raises the generated standard gemspec template’s kettle-dev minimum to 2.3.7.
gems/kettle-jem/lib/kettle/jem.rb	Updates the monorepo-root Gemfile dependency source line for kettle-dev to >= 2.3.7.
gems/kettle-jem/CHANGELOG.md	Updates the changelog entry to reflect the new generated-template dependency floor.

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