isobject 4.1.1

This release improves the TypeScript experience and modernizes the project infrastructure without changing the runtime API.

What’s changed

• isObject is now declared as a TypeScript type predicate, so successful checks narrow values to an object type.
• Updated the build and test tooling while preserving compatibility with legacy and current Node.js versions.
• Added GitHub Actions CI and automated npm publishing with provenance.
• Refreshed the documentation and added a security reporting policy.
• Fixed the release workflow by pinning compatible Node.js and npm versions.

Full changelog: 4.0.0...4.1.1