Bump version of go-github to v68.0.0

[gmlewis]

This release contains the following breaking API changes:

• feat!: Remove Project (classic) support #3380
  BREAKING CHANGE: All support for "Project (classic)" is removed and Project responses are replaced by ProjectV2 (renamed from ProjectsV2).
• fix!: Remove unused Stats field from Commit struct #3395
  BREAKING CHANGE: The unused Stats field is removed from the Commit struct.

...and the following additional changes:

• Bump go-github from v66 to v67 in /scrape #3361
• Map more missing installation permissions #3363
• build(deps): bump github.com/alecthomas/kong from 1.4.0 to 1.5.0 in /tools #3365
• Fix: Preserve HTTP Response in URL Errors #3369
• Update OpenAPI #3374
• feat: Add assignment for org role associations #3371
• build(deps): bump codecov/codecov-action from 5.0.7 to 5.1.1 #3375
• build(deps): bump github.com/alecthomas/kong from 1.5.0 to 1.6.0 in /tools #3376
• build(deps): bump golang.org/x/sync from 0.9.0 to 0.10.0 in /tools #3377
• build(deps): bump golang.org/x/net from 0.31.0 to 0.32.0 in /scrape #3378
• chore: Deprecate legacy ID-based team methods #3373
• feat: Support resolution_comment to update alert API #3357
• feat: Add custom_property events #3379
• feat: Deprecate and replace Bool,Int,Int64,String with Ptr using generics #3355
• feat: Add get for custom org repo role #3372
• chore: Remove commented out test code #3381
• build(deps): bump golang.org/x/crypto from 0.27.0 to 0.31.0 in /example in the go_modules group #3383
• feat: Add enterprise custom properties #3382
• refactor: Change header keys to be canonical #3389
• chore: Sort std imports #3390
• feat: Document review request events in Timeline struct #3391
• fix: DownloadReleaseAsset handles renamed repository #3392

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.21%. Comparing base (2b8c7fa) to head (cec8d14).
Report is 204 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3397      +/-   ##
==========================================
- Coverage   97.72%   92.21%   -5.51%     
==========================================
  Files         153      173      +20     
  Lines       13390    14770    +1380     
==========================================
+ Hits        13085    13620     +535     
- Misses        215     1060     +845     
  Partials       90       90              

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