[pull] develop from ohler55:develop

[pull]

See Commits and Changes for more details.

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Created by pull[bot] (v2.0.0-alpha.1)

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Summary by Sourcery

Update CI configurations to add Rails 8 and drop Rails 6.1 support.

CI:

• Add Rails 8 to the CI matrix.
• Remove Rails 6.1 from the CI matrix.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request updates the CI workflow file to add Rails 8 and remove Rails 6.1. It also adds a gemfile for Rails 8 and removes the gemfile for Rails 6.1.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Update CI workflow to include Rails 8 and exclude Rails 6.1	Added Rails 8 to the gemfile matrix. Removed Rails 6.1 from the gemfile matrix. Added exclusions for Rails 8 with Ruby 2.7, 3.0, and 3.1. Removed exclusions for Rails 7.2 with Ruby 2.7 and 3.0. Removed inclusions for Rails 6 with Ruby 2.7 on macOS and Ubuntu.	.github/workflows/CI.yml
Add gemfile for Rails 8 and remove gemfile for Rails 6.1	Added a new gemfile for Rails 8. Removed the gemfile for Rails 6.1.	gemfiles/rails_6.1.gemfile gemfiles/rails_8.gemfile

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