Update dependency knplabs/github-api to v3.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
knplabs/github-api	3.14.1 -> 3.15.0

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Release Notes

KnpLabs/php-github-api (knplabs/github-api)

v3.15.0

Compare Source

Added

• Fix implicit nullable types to avoid PHP 8.4 warnings (eiriksm, acrobat) #​1144
• Add API endpoints to interact with organization roles (glaubinix) #​1143
• Copilot Usage Endpoints (anthony-webart) #​1142
• Fix type error in ResultPager::fetch (nunoplopes) #​1132

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