Bump version of go-github to v64.0.0

[gmlewis]

This release contains the following breaking API changes:

• feat!: Add support for multi-select Custom Properties #3200
  BREAKING CHANGE: CustomPropertyValue.Value is changed from *string to interface{} to support string and []string values.
• feat!: Replace ListCursorOptions with ListIDPGroupsOptions in TeamsService.ListIDPGroupsInOrganization #3197
  BREAKING CHANGE: Replace ListCursorOptions with ListIDPGroupsOptions in TeamsService.ListIDPGroupsInOrganization
• feat!: Add support for creating GitHub App with organizations #3222
  BREAKING CHANGE: The CreateApp function now requires two arguments: AppManifest and orgName, to support creating apps with organizations.
• feat!: Widen CustomProperties type to map[string]interface{} to align with GitHub API #3230
  BREAKING CHANGE: PushEventRepository.CustomProperties is changed from map[string]string to map[string]interface{}.

...and the following additional changes:

• Bump go-github from v61 to v63 in /scrape #3206
• Add doc for NewPullRequest #3208
• Added iterators section in README #3212
• Update CustomOrgRoles and CustomRepoRoles to include all fields returned by the GitHub API #3216
• Revert "Add CommitID, InReplyTo, and SubjectType to DraftReviewComment" #3218
• Add List fine-grained personal access tokens with access to organization resources API #3215
• Bump github.com/getkin/kin-openapi from 0.126.0 to 0.127.0 in /tools #3223
• Bump golang.org/x/sync from 0.7.0 to 0.8.0 in /tools #3224
• Bump golang.org/x/net from 0.27.0 to 0.28.0 in /scrape #3234
• Allow create custom repository/organization roles without permission #3235
• Add support for filepath repository rules #3233

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.95%. Comparing base (2b8c7fa) to head (7a5f3d9).
Report is 97 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3240      +/-   ##
==========================================
- Coverage   97.72%   92.95%   -4.78%     
==========================================
  Files         153      171      +18     
  Lines       13390    11646    -1744     
==========================================
- Hits        13085    10825    -2260     
- Misses        215      727     +512     
- Partials       90       94       +4     

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