fix: point action.yml to correct major version tag

[jmeridth]

Fixes: #325

Pull Request

Update version reference in action.yml, README.md and use-action workflow to v3

Proposed Changes

Readiness Checklist

Author/Contributor

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Reviewer

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[Copilot]

Pull Request Overview

Bumps the Docker image tag in action.yml from v1 to the correct v3 major version.

• Updated runs.image reference to use stale_repos:v3

Comments suppressed due to low confidence (1)

action.yml:10

• [nitpick] Consider updating any related documentation or examples (e.g., README) to reference the new v3 image tag so users aren’t confused by mismatched version numbers.

image: "docker://ghcr.io/github/stale_repos:v3"