major(deps): update module github.com/google/go-github/v85 to v86

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/google/go-github/v85	v85.0.0 → v86.0.0

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Release Notes

google/go-github (github.com/google/go-github/v85)

v86.0.0

Compare Source

This release contains the following breaking API changes:

• feat!: Refactor request context (#​4151)
  BREAKING CHANGE: All internal calls now provide Context via the Request itself.
• feat!: Add OIDC authentication support to PrivateRegistries (#​4159)
  BREAKING CHANGE: PrivateRegistriesService is updated to API version 2026-03-10 with struct and response changes.

...and the following additional changes:

• chore: Bump version of go-github to v86.0.0 (#​4198)
• test: Fix invalid JSON payloads in actions workflow runs tests (#​4197)
• feat: Add repo download contents sentinel errors (#​4192)
• chore: Fix otel module name (#​4187)
• feat: Add typed Copilot metrics download helpers (#​4177)
• feat: Add deploy_keys_enabled_for_repositories and secret scanning custom link fields to Organization struct (#​4188)
• refactor: Use testJSONBody helper for request body assertions in tests (#​4183)
• build(deps): Bump github.com/getkin/kin-openapi from 0.135.0 to 0.137.0 in /tools (#​4184)
• fix: Include RetryAfter in AbuseRateLimitError.Error output (#​4181)
• fix: Handle string-typed reviewer ID in Ruleset API responses (#​4178)
• feat: Add ArchivedAt field to Organization struct (#​4179)
• feat: Add Copilot coding agent and content exclusion org endpoints (#​4176)
• chore: Bump go-github from v84 to v85 in /scrape (#​4174)

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