chore(deps): update pre-commit hook tox-dev/pyproject-fmt to v2.21.0 (#259)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.pre-commit-config.yaml

@@ -38,7 +38,7 @@ repos:
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/tox-dev/pyproject-fmt
-    rev: "v2.20.0"
+    rev: "v2.21.0"
     hooks:
       - id: pyproject-fmt
   - repo: https://github.com/34j/sync-python-matrix