chore(deps-dev): Bump shfmt-py from 3.12.0.2 to 4.0.0

Bumps [shfmt-py](https://github.com/maxwinterstein/shfmt-py) from 3.12.0.2 to 4.0.0.
- [Release notes](https://github.com/maxwinterstein/shfmt-py/releases)
- [Commits](https://github.com/maxwinterstein/shfmt-py/commits/v4.0.0)

---
updated-dependencies:
- dependency-name: shfmt-py
  dependency-version: 4.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

pyproject.toml

@@ -69,7 +69,7 @@ optional-dependencies.dev = [
     # but also because having it installed means that ``actionlint-py`` will
     # use it to lint shell commands in GitHub workflow files.
     "shellcheck-py==0.11.0.1",
-    "shfmt-py==3.12.0.2",
+    "shfmt-py==4.0.0",
     "sphinx==9.1.0",
     "sphinx-copybutton==0.5.2",
     "sphinx-lint==1.0.2",