update passenger to 3.1.6 and ruby to 3.2.10

[digitaldogsbody]

Purpose

Update passenger and ruby to fix repo signing error

See: https://blog.phusion.nl/important-new-signing-key-for-passenger/

closes: Add github issue that originated this PR

Approach

Open Questions and Pre-Merge TODOs

Learning

Types of changes

• Bug fix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to change)

Reviewer, please remember our guidelines:

• Be humble in the language and feedback you give, ask don't tell.
• Consider using positive language as opposed to neutral when offering feedback. This is to avoid the negative bias that can occur with neutral language appearing negative.
• Offer suggestions on how to improve code e.g. simplification or expanding clarity.
• Ensure you give reasons for the changes you are proposing.

Summary by CodeRabbit

• Chores
  • Upgraded Ruby runtime version from 3.2.9 to 3.2.10 across all continuous integration workflows and development environment configurations to ensure consistency across the project
  • Updated Docker container base image to the latest stable release for improved system-level compatibility and tooling support

[coderabbitai]

📝 Walkthrough

Walkthrough

Ruby version bumped from 3.2.9 to 3.2.10 across CI workflows, configuration files, and Gemfile. Dockerfile base image also updated from 3.1.4 to 3.1.6 alongside the Ruby version change.

Changes

Cohort / File(s)	Summary
CI Workflows .github/workflows/parallel_ci.yml, .github/workflows/rubocop.yml	Ruby version updated from 3.2.9 to 3.2.10 in setup steps.
Configuration Files .ruby-version, Gemfile	Ruby version requirement bumped from 3.2.9 to 3.2.10.
Docker Configuration Dockerfile	Base image upgraded from phusion/passenger-ruby32:3.1.4 to 3.1.6; Ruby version in image updated from 3.2.9 to 3.2.10.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately reflects the main changes in the pull request: updating Passenger to 3.1.6 and Ruby to 3.2.10 across all modified files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch update_passenger

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