Update actions/checkout action to v4 - autoclosed

This PR contains the following updates:

Package	Type	Update	Change
actions/checkout	action	major	`v3` -> `v4`
actions/checkout	action	major	`v2` -> `v4`

Release Notes

actions/checkout (actions/checkout)

### [`v4`](https://togithub.com/actions/checkout/blob/HEAD/CHANGELOG.md#v400) [Compare Source](https://togithub.com/actions/checkout/compare/v3...v4) - [Support fetching without the --progress option](https://togithub.com/actions/checkout/pull/1067) - [Update to node20](https://togithub.com/actions/checkout/pull/1436)

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

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PR-Codex overview

This PR updates the GitHub Actions versions used in the workflows and replaces the deprecated actions/checkout@v2 with actions/checkout@v4.

Detailed summary

Updated the version of actions/checkout from v2 to v4 in .github/workflows/pdd.yaml
Updated the version of actions/checkout from v3 to v4 in .github/workflows/xcop.yaml
Updated the version of actions/checkout from v2 to v4 in .github/workflows/codecov.yaml
Updated the version of actions/checkout from v2 to v4 in .github/workflows/mvn.yaml
Removed the usage of g4s8/pdd-action@master in .github/workflows/pdd.yaml
Removed the usage of g4s8/xcop-action@master in .github/workflows/xcop.yaml

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objectionary / ineo-maven-plugin