chore: release v2.4.0 (#52)

## 🤖 New release

* `near-account-id`: 2.3.0 -> 2.4.0 (✓ API compatible changes)

<details><summary><i><b>Changelog</b></i></summary><p>

<blockquote>

##
[2.4.0](v2.3.0...v2.4.0)
- 2025-12-11

### Added

- `parent.subaccount(name) -> AccountId`
([#51](#51))
</blockquote>


</p></details>

---
This PR was generated with
[release-plz](https://github.com/release-plz/release-plz/).

Author: frol

CHANGELOG.md

@@ -7,6 +7,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [2.4.0](https://github.com/near/near-account-id-rs/compare/v2.3.0...v2.4.0) - 2025-12-11
+
+### Added
+
+- Added a new method to construct sub-account ID: `account_id.sub_account(prefix) -> Result<AccountId, ParseError>` ([#51](https://github.com/near/near-account-id-rs/pull/51))
+
 ## [2.3.0](https://github.com/near/near-account-id-rs/compare/v2.2.0...v2.3.0) - 2025-12-09
 
 ### Added

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "near-account-id"
-version = "2.3.0"
+version = "2.4.0"
 authors = ["Near Inc <hello@nearprotocol.com>"]
 edition = "2021"
 description = "This crate contains the Account ID primitive and its validation facilities"