chore: bump express-openapi-validator to latest stable version

[cvchauhan]

Summary

Updated the express-openapi-validator package to the latest stable version in package.json to ensure compatibility with newer OpenAPI specs, bug fixes, and security improvements.

Changes

• Updated express-openapi-validator from 5.5.7 to 5.5.8.

Why This Change?

• Stay up-to-date with latest features and patches.
• Fix potential bugs or deprecations in the current version.
• Align with ongoing improvements in OpenAPI support and validation performance.

Testing

• All unit and integration tests passed.
• Verified API validation flow with sample OpenAPI spec.
• No breaking changes observed in route validation or schema enforcement.

[cvchauhan]

@cdimascio please release new version
Hi @cdimascio when we get this in npm packages? we have blocker for our project