chore: disable oxfmt for CHANGELOG.md

[vadyvas]

What/Why/How?

Disable oxfmt for CHANGELOG.md

Reference

• https://github.com/Redocly/redocly-cli/pull/2557/changes#diff-49d0ad40360a133ac46b22c6bd4bbc1a1e4b37054e94244dccbe314d4d847955R404
• https://github.com/Redocly/redocly-cli/actions/runs/21904533655/job/63241190920?pr=2557

Testing

Screenshots (optional)

Check yourself

• Code changed? - Tested with Redoc/Realm/Reunite (internal)
• All new/updated code is covered by tests
• New package installed? - Tested in different environments (browser/node)
• Documentation update considered

Security

• The security impact of the change has been considered
• Code follows company security practices and guidelines

[changeset-bot]

⚠️ No Changeset found

Latest commit: 691e6bc

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	79.4% (🎯 78%)	6313 / 7950
🔵	Statements	78.82% (🎯 78%)	6520 / 8271
🔵	Functions	83.32% (🎯 82%)	1294 / 1553
🔵	Branches	70.97% (🎯 70%)	4296 / 6053

File Coverage

No changed files found.

Generated in workflow #8601 for commit 691e6bc by the Vitest Coverage Report Action

[github-actions]

CLI Version	Mean Time ± Std Dev (s)	Relative Performance (Lower is Faster)
cli-latest	3.580s ± 0.022s	▓ 1.00x
cli-next	3.567s ± 0.021s	▓ 1.00x (Fastest)