mirror.py does not update prek rev in README.md

[Anselmoo]

Bug

mirror.py updates the pre-commit YAML-style rev: entries in README.md but silently skips the prek TOML-style rev = entry. After many mirror runs the prek block falls behind:

[[repos]]
repo = "https://github.com/astral-sh/ruff-pre-commit"
rev = "v0.15.0"  # ← never updated, currently 18 releases behind

while all pre-commit blocks show the current version:

  rev: v0.15.18  # ← correctly updated

Root cause

replace_readme_md in mirror.py matches rev: v\d+\.\d+\.\d+ (colon, no quotes) but not rev = "v\d+\.\d+\.\d+" (equals + quotes).

Fix

Add one re.sub call inside replace_readme_md:

content = re.sub(r'rev = "v\d+\.\d+\.\d+"', f'rev = "v{version}"', content)