Remove mdformat frontmatter since we are not using

Author: willingc

.pre-commit-config.yaml

@@ -22,7 +22,7 @@ repos:
     hooks:
       - id: codespell
         additional_dependencies: [tomli]
-  
+
   - repo: https://github.com/psf/black
     rev: 25.11.0
     hooks:
@@ -35,7 +35,6 @@ repos:
       - id: mdformat
         additional_dependencies:
           - mdformat-gfm
-          - mdformat_frontmatter
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
     rev: v0.14.5