chore(deps): update actions/checkout action to v4.3.1

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	patch	v4.3.0 -> v4.3.1

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Release Notes

actions/checkout (actions/checkout)

v4.3.1

Compare Source

What's Changed

• Port v6 cleanup to v4 by @​ericsciple in #​2305

Full Changelog: actions/checkout@v4...v4.3.1

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Configuration

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[giselles-ai]

Check changeset necessity

Status:

• NOT REQUIRED

Reason:

• This PR updates GitHub Actions workflow dependency actions/checkout from v4.3.0 to v4.3.1 only.
• No changes to any target publishable packages (@liam-hq/cli, @liam-hq/erd-core, @liam-hq/schema, @liam-hq/ui).
• No user-facing feature, bug fix, API, performance, or behavioral changes in runtime packages.
• This is a development tooling/CI change, which is explicitly excluded from requiring a changeset.

Changeset (copy & paste):

---
"@liam-hq/package-a": patch
"@liam-hq/package-b": patch
---
- ♻️ CI-only maintenance
  - Update GitHub Actions checkout to v4.3.1