Fix vulnerable dependencies and enable Dependabot

[Copilot]

Addresses EOL toolchain usage in CI and pins avro to the current release series; adds Dependabot to keep both ecosystems current going forward.

Dependency updates

• avro: ~> 1.11.0 → ~> 1.12 (latest: 1.12.1)

CI hardening

• actions/checkout: v3 (Node 16, EOL) → v4 (Node 20)
• Ruby test matrix: 2.7, 3.0 (both EOL) → 3.1, 3.2, 3.3

Dependabot (new: .github/dependabot.yml)

Weekly automated PRs for bundler and github-actions, capped at 10 open PRs per ecosystem.

Warning

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• rubysec.com
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Original prompt

Create a pull request for repository HealthDataInsight/ndr_avro to address existing security vulnerabilities in dependencies and set up Dependabot to create ongoing update PRs.

Requirements:

1. Fix current vulnerabilities

   • Inspect the repository dependency manifests (e.g., package.json, package-lock.json/yarn.lock/pnpm-lock.yaml, pom.xml, build.gradle, requirements.txt, Pipfile.lock, go.mod, etc.).
   • Identify dependencies with known vulnerabilities.
   • Upgrade or patch dependencies to versions that remediate the vulnerabilities.
   • Ensure updates are compatible and do not break builds.
   • Run/adjust tests and CI configuration as needed so the PR passes.
   • If multiple ecosystems exist, address each.

2. Add Dependabot configuration

   • Add .github/dependabot.yml configured for all relevant package ecosystems present in the repo.
   • Set a reasonable update schedule (e.g., weekly) and open PR limits.
   • Configure security updates to be enabled.
   • If the repo uses GitHub Actions, include github-actions updates.
   • If the repo uses Dockerfiles, include docker updates.

3. Quality and documentation

   • Add/update documentation in README.md or a security/dependency policy file describing Dependabot behavior (optional but preferred).
   • Keep changes minimal and focused.

Deliverable:

• Open a PR with a clear title (e.g., "Fix vulnerable dependencies and enable Dependabot") and a description summarizing what was updated and why.

This pull request was created from Copilot chat.

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