#2516 Fix additional props in openapi health schema

[pauliusg]

PR Checklist

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• The commit message follows our guidelines: https://github.com/nestjs/terminus/blob/master/CONTRIBUTING.md
• Tests for the changes have been added (for bug fixes / features)
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PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• [x ] Other... Please describe:
  Schema does not match health-indicator-result interface #2516 Fix additional props in openapi health schema

What is the current behavior?

Described in issue.

Issue Number: #2516

What is the new behavior?

Described in issue.

Does this PR introduce a breaking change?

• Yes
• [x ] No

[BrunnerLivio]

Thanks, released with v10.2.3