ci: Omit --fix arg

When running `ruff` via pre-commit, don't automatically fix the
problems; instead tell the user what's wrong to train them into not
making the problems in the first place.

Author: jmgate

.pre-commit-config.yaml

@@ -10,7 +10,6 @@ repos:
       rev: v0.5.0
       hooks:
         - id: ruff
-          args: [ --fix ]
         - id: ruff-format
 
     - repo: https://github.com/pre-commit/mirrors-mypy