chore: Bump version of go-github to v86.0.0

[gmlewis]

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:

• 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

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.71%. Comparing base (5c3fa31) to head (fe4910c).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4198   +/-   ##
=======================================
  Coverage   93.71%   93.71%           
=======================================
  Files         209      209           
  Lines       19772    19772           
=======================================
  Hits        18529    18529           
  Misses       1046     1046           
  Partials      197      197           

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