Bump pyproject-fmt from 2.20.0 to 2.21.0

Bumps [pyproject-fmt](https://github.com/tox-dev/toml-fmt) from 2.20.0 to 2.21.0.
- [Release notes](https://github.com/tox-dev/toml-fmt/releases)
- [Commits](tox-dev/toml-fmt@pyproject-fmt/2.20.0...pyproject-fmt/2.21.0)

---
updated-dependencies:
- dependency-name: pyproject-fmt
  dependency-version: 2.21.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

pyproject.toml

@@ -52,7 +52,7 @@ optional-dependencies.dev = [
     "prek==0.3.8",
     "pydocstringformatter==0.7.5",
     "pylint[spelling]==4.0.5",
-    "pyproject-fmt==2.20.0",
+    "pyproject-fmt==2.21.0",
     "pyrefly==0.58.0",
     "pyright==1.1.408",
     "pyroma==5.0.1",