chore(deps): update dependency knplabs/github-api to ^3.15.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
knplabs/github-api	^3.12 -> ^3.15.0

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Release Notes

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

v3.15.0

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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

v3.14.1

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Fixed

• Handle case of GitHub returning 204 No Content in some scenarios (tomcorbett) #​1135

v3.14.0

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Added

• Allow php-http/cache-plugin v2 (GrahamCampbell) #​1134

v3.13.0

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Added

• Test against php 8.3 (sergiy-petrov) #​1124
• feat: Secret Scanning Alerts (haridarshan) #​1114
• feat: User Migration (haridarshan) #​1115

Changed

• General chores (acrobat) #​1125

Fixed

• Fix detection of secondary rate limit (mathieudz) #​1126

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