chore: release (#588)

## 🤖 New release

* `mutants`: 0.0.3 -> 0.0.4
* `cargo-mutants`: 26.1.1 -> 26.1.2

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

## `mutants`

<blockquote>

##
[0.0.4](mutants-v0.0.3...mutants-v0.0.4)
- 2026-01-15

### Changed

- Add NEWS.md for `mutants` package
</blockquote>

## `cargo-mutants`

<blockquote>

##
[26.1.2](cargo-mutants-v26.1.1...cargo-mutants-v26.1.2)
- 2026-01-15

### Changed

- Revert "ci: Don't need to run mdbook-linkcheck again during deploy"
- Simpler changelog header
- Shallow fetch in more CI workflows
- Don't need to run mdbook-linkcheck again during deploy
- Fix git ref in book deploy job
- Merge the two book workflows
</blockquote>


</p></details>

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

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "cargo-mutants"
-version = "26.1.1"
+version = "26.1.2"
 edition = "2024"
 authors = ["Martin Pool"]
 license = "MIT"

Cargo.toml

@@ -7,6 +7,17 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+## [26.1.2](https://github.com/sourcefrog/cargo-mutants/compare/cargo-mutants-v26.1.1...cargo-mutants-v26.1.2) - 2026-01-15
+
+### Changed
+
+- Revert "ci: Don't need to run mdbook-linkcheck again during deploy"
+- Simpler changelog header
+- Shallow fetch in more CI workflows
+- Don't need to run mdbook-linkcheck again during deploy
+- Fix git ref in book deploy job
+- Merge the two book workflows
+
 ## 26.1.1 - 2026-01-15
 
 ### Other

NEWS.md

@@ -1,6 +1,6 @@
 [package]
 name = "mutants"
-version = "0.0.3"
+version = "0.0.4"
 edition = "2018"
 license = "MIT"
 description = "Decorator attributes to be used with cargo-mutants"

mutants_attrs/Cargo.toml

@@ -2,6 +2,12 @@
 
 ## [Unreleased]
 
+## [0.0.4](https://github.com/sourcefrog/cargo-mutants/compare/mutants-v0.0.3...mutants-v0.0.4) - 2026-01-15
+
+### Changed
+
+- Add NEWS.md for `mutants` package
+
 ## 0.0.3
 
 * Reset edition to 2018 for broader compatibility.