Update Ubuntu runner from ubuntu-20.04 to ubuntu-latest in GitHub workflows

[Copilot]

GitHub workflow files were using the deprecated ubuntu-20.04 runner image which is scheduled for removal by GitHub.

Changes Made

Updated .github/workflows/python-check.yaml to use ubuntu-latest instead of ubuntu-20.04:

- os: ["ubuntu-20.04"]
+ os: ["ubuntu-latest"]

Benefits

• Future-proof: ubuntu-latest always uses the most recent stable Ubuntu LTS version
• Security: Receives the latest security updates and patches
• Tooling: Includes updated tooling and dependencies
• Consistency: All workflow files now consistently use ubuntu-latest

Validation

• ✅ YAML syntax validated successfully
• ✅ No other instances of ubuntu-20.04 found in workflow files
• ✅ Change is minimal and surgical (1 line modified)
• ✅ Follows the same pattern used in other workflow files

Fixes #94.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• esm.ubuntu.com
  • Triggering command: /usr/lib/apt/methods/https (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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[pamelafox]

@copilot can you change ruff to
“ruff check .”

[Copilot]

@copilot can you change ruff to
“ruff check .”

Changed ruff command to ruff check . in commit 03a0ba4. The linting step now uses the explicit subcommand for better clarity and follows ruff's modern command structure.