[pre-commit.ci] pre-commit autoupdate (#962)

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

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: pre-commit-ci[bot]

.pre-commit-config.yaml

@@ -20,7 +20,7 @@ repos:
       - id: check-yaml
         exclude: devtools/conda.recipe/meta.yaml  # doesn't play nice with jinja
   - repo: https://github.com/executablebooks/mdformat
-    rev: 0.7.19
+    rev: 0.7.21
     hooks:
       - id: mdformat
         additional_dependencies:
@@ -29,7 +29,7 @@ repos:
           - mdformat-config
   # ----- Python formatting -----
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.8.1
+    rev: v0.8.6
     hooks:
     # Run ruff linter.
     - id: ruff