OKTA-1257809 fix OSQueryCustomChecksTimeout plist type

[brentschaus-okta]

Description:

• What's changed? Fixed the macOS OktaVerify.OSQueryCustomChecksTimeout configuration example to use the <string> plist type instead of <integer>, matching the actual code behavior and help.okta.com's documentation.
• Is this PR related to a Monolith release? No.

Resolves:

• OKTA-1257809

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[okta-prod-github-app]

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Article	Total score Required:80	Word and phrases (Brand, terms) Preferred: 80	Correctness (Spelling, grammar) Preferred: 80	Clarity (Readability) Preferred: 80	Inclusive language (+ accesibility) Preferred: 80
✅ packages/@okta/vuepress-site/docs/guides/device-assurance-posture-checks-and-remediation/main/index.md	90	100	77	80

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