Add github workflow and script to auto update vendordeps

[timtogan]

This adds an automation for updating WPILib vendordep JSON files through GitHub Actions that runs monday at 12:00 UTC. A script fetches the latest vendordep versions from the WPILib marketplace, updates local files if newer versions are available, and generates a markdown summary, if there is any updated a PR is opened with the markdown summary as the body.

[Copilot]

Pull request overview

Adds a scheduled GitHub Actions automation to keep WPILib vendordep JSON files up to date by checking the WPILib vendordep marketplace, updating local vendordeps/*.json when newer versions exist, and opening a PR with a generated markdown summary.

Changes:

• Introduces a scheduled/manual GitHub Actions workflow to run the updater and open a PR via peter-evans/create-pull-request.
• Adds a Python script that fetches per-year marketplace manifests, compares vendordep versions by UUID, and updates local vendordep files while emitting a markdown summary.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 3 comments.

File	Description
.github/workflows/update-vendordeps.yml	Adds the scheduled workflow that runs the vendordep update script and creates a PR with the summary.
.github/scripts/update_vendordeps.py	Implements the vendordep marketplace fetch/compare/update logic and generates the PR summary.

Suppressed comments (1)

.github/scripts/update_vendordeps.py:119

• The script collects errors but always returns 0, so the scheduled workflow can appear successful even when it didn't actually check/update vendordeps (and no PR will be created to surface the error summary). Returning a non-zero exit code when errors is non-empty would make failures visible in Actions.

 print(summary)
if args.summary:
args.summary.write_text(summary)
return 0

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