chore(pre-commit): update jackdewinter/pymarkdown to v0.9.18

Author: renovate[bot]

.pre-commit-config.yaml

@@ -83,7 +83,7 @@ repos:
         files: ^(helpers/perl|.+\.p[ml])$
 
   - repo: https://github.com/jackdewinter/pymarkdown
-    rev: v0.9.17
+    rev: v0.9.18
     hooks:
       - id: pymarkdown
         entry: pymarkdown