chore: release v0.4.2

[ros2-rust-release-plz]

🤖 New release

• rosidl_runtime_rs: 0.4.1 -> 0.4.2 (✓ API compatible changes)

Changelog

0.4.2 - 2025-07-11

Fixed

• add Cargo.lock to version control (#3)

Other

• add release-plz CI action (#5)
• added changelog
• Update for clippy 1.83 (#441)
• Action message support (#417)
• Add in missing nullptr check when calling std::slice::from_raw_parts (#416)
• Fix panic on sequence_init() when size is 0 (#407)
• Add parameter services (#342)
• Use nightly for style check (#396)
• Fix Unicode handling in String and WString (#362)

---

This PR was generated with release-plz.

[maspe36]

Interestingly, this didn't seem to create a release tag @esteve

EDIT: I guess I'm wrong, I do see the tag now.