chore: release v0.4.2

[esteve]

🤖 New release

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

Changelog

0.4.2 - 2025-07-04

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)

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This PR was generated with release-plz.