Update debug requirement from ~> 1.8.0 to ~> 1.9.1

[dependabot]

Updates the requirements on debug to permit the latest version.

Release notes

Sourced from debug's releases.

v1.9.1

Fix small issue to release with Ruby 3.3.0.

What's Changed

• Fix BT on nested break by @​ko1 in ruby/debug#1047

Full Changelog: ruby/debug@v1.9.0...v1.9.1

Commits

• 9de0ff4 v1.9.1
• 557233a fix bt on nested break points
• 52694a9 add verbose mode for debug_code
• d4feeae fix condition of USE_TMP_HOME
• 65519e4 v1.9.0
• c855148 check 3.2 on protocol.yml
• acd5fc5 support Ruby 3.3
• 04c22c5 Do not make a Fiber for commands
• 3d44584 fix indentation
• 9c3b8c4 Revert "Increase timeout to 30 seconds."
• Additional commits viewable in compare view

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[deivid-rodriguez]

This is not updating the lockfile because of a bug in Bundler, which fails to include debug in the lockfile in this situation. It should get fixed by rubygems/rubygems#7358 once we upgrade. In any case, this is already included in #8676, so I'll close this PR.

[dependabot]

OK, I won't notify you again about this release, but will get in touch when a new version is available. If you'd rather skip all updates until the next major or minor version, let me know by commenting @dependabot ignore this major version or @dependabot ignore this minor version. You can also ignore all major, minor, or patch releases for a dependency by adding an ignore condition with the desired update_types to your config file.

If you change your mind, just re-open this PR and I'll resolve any conflicts on it.