[pre-commit.ci] pre-commit autoupdate

updates:
- [github.com/astral-sh/ruff-pre-commit: v0.8.1 → v0.8.6](astral-sh/ruff-pre-commit@v0.8.1...v0.8.6)
- [github.com/executablebooks/mdformat: 0.7.19 → 0.7.21](hukkin/mdformat@0.7.19...0.7.21)

.pre-commit-config.yaml

@@ -5,7 +5,7 @@ ci:
 repos:
   # autoformat and lint Python code
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.8.1
+    rev: v0.8.6
     hooks:
       - id: ruff
         types_or:
@@ -26,7 +26,7 @@ repos:
 
   # Autoformat: markdown
   - repo: https://github.com/executablebooks/mdformat
-    rev: 0.7.19
+    rev: 0.7.21
     hooks:
       - id: mdformat
         additional_dependencies: