security: add CodeQL and Actions dependency updates

[mkarson1997]

Adds CodeQL security-extended analysis for the Python validation surface, weekly Dependabot coverage for GitHub Actions, and scopes the existing ML portfolio validation workflow to job-level read permissions.

Summary by Sourcery

Strengthen repository security scanning, automate GitHub Actions dependency updates, and minimize workflow permissions.

New Features:

• Add scheduled CodeQL security-extended analysis for Python on pushes and pull requests targeting main.
• Add weekly Dependabot updates for GitHub Actions dependencies.

Enhancements:

• Scope repository validation workflow permissions to the validation job with read-only contents access.

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.

[sourcery-ai]

Reviewer's Guide

Introduces scheduled and PR-triggered CodeQL security-extended analysis for Python, enables weekly Dependabot coverage for GitHub Actions, and narrows the existing quality workflow's repository read permission to the job that requires it.

File-Level Changes

Change	Details	Files
Adds automated CodeQL security scanning for the Python validation surface.	Runs on main pushes, pull requests, and a weekly schedule. Uses CodeQL security-extended queries with scoped read and security-events write permissions. Pins checkout and CodeQL action integrations to major versions and limits analysis runtime.	.github/workflows/codeql.yml
Adds weekly Dependabot updates for GitHub Actions dependencies.	Scans Actions declared from the repository root. Limits open Dependabot pull requests to five.	.github/dependabot.yml
Scopes workflow permissions to the validation job.	Moves contents read access from workflow scope to validate-repository job scope.	.github/workflows/quality.yml

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[github-advanced-security]

You are seeing this message because GitHub Code Scanning has recently been set up for this repository, or this pull request contains the workflow file for the Code Scanning tool.

What Enabling Code Scanning Means:

• The 'Security' tab will display more code scanning analysis results (e.g., for the default branch).
• Depending on your configuration and choice of analysis tool, future pull requests will be annotated with code scanning analysis results.
• You will be able to see the analysis results for the pull request's branch on this overview once the scans have completed and the checks have passed.

For more information about GitHub Code Scanning, check out the documentation.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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