Ignore yaml and json in prettier pre-commit hook

The .prettierignore file appears to not be respected,
but I think this is the only relevant discrepancy with .prettierignore,
as we either won't change the remaining files or they're already in
.gitignore.

Author: mvdbeek

.pre-commit-config.yaml.sample

@@ -13,6 +13,9 @@ repos:
     - id: prettier
       additional_dependencies:
         - [email protected] # SEE: https://github.com/pre-commit/pre-commit/issues/3133
+      exclude_types:  # .prettierignore ignored apparently ...
+        - yaml
+        - json
   - repo: https://github.com/pre-commit/pre-commit-hooks
     rev: v4.5.0  # Use the ref you want to point at
     hooks: