message: Update changelog rewriting step to match v2+ only release notes
diff: @@ -286,7 +286,7 @@ def main():
  subprocess.run(['sed', '-i', 's/^## 2\./## 1./g', 'CHANGELOG.md'])
  # Remove changelog notes from v2 that don't apply to v1
  - subprocess.run(['sed', '-i', '/^- The CodeQL Action now runs on Node\.js v16\./d', 'CHANGELOG.md'])
  + subprocess.run(['sed', '-i', '/^- \[v2+ only\]/d', 'CHANGELOG.md'])
  # Amend the commit generated by `npm version` to update the CHANGELOG
  run_git('add', 'CHANGELOG.md')
  