v0.5.1

• refactor: move bump-pre-commit-rev into local composite action
• feat: bump pre-commit rev in prepare-release, drop Dependabot pre-commit ecosystem
• chore(deps): bump https://github.com/rubykatzen/baseline
• fix: remove stale conflict marker from README
• Replace pre-commit autoupdate workflow with Dependabot.
• docs: add erb_lint todo file format and creation instructions
• fix: inherit baseline rubocop config inside erb_lint rubocop_config
• fix: pin transitive gem dependencies to minor versions in gemspec
• fix: use HTTPS URLs in pre-commit configs for Dependabot compatibility