Merge pull request gitpython-developers#1921 from Borda/precommit/validate-pyproject

precommit: enable `validate-pyproject`

Author: Byron

.pre-commit-config.yaml

@@ -21,3 +21,8 @@ repos:
   - id: check-toml
   - id: check-yaml
   - id: check-merge-conflict
+
+- repo: https://github.com/abravalheri/validate-pyproject
+  rev: v0.16
+  hooks:
+    - id: validate-pyproject