Bump version of go-github to v78.0.0

[gmlewis]

This release contains the following breaking API changes:

• feat!: Address post-merge enterprise billing cost center review #3805
  BREAKING CHANGES: Various EnterpriseService structs have been renamed for consistency.

...and the following additional changes:

• Bump go-github from v76 to v77 in /scrape #3801
• Update openapi_operations.yaml #3802
• feat: Add support for enterprise billing cost centers API #3803
• feat: Add sha_pinning_required to ActionsPermissions structs #3807

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.27%. Comparing base (1b0a91c) to head (351f8c1).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3815   +/-   ##
=======================================
  Coverage   92.27%   92.27%           
=======================================
  Files         192      192           
  Lines       13896    13896           
=======================================
  Hits        12823    12823           
  Misses        884      884           
  Partials      189      189           

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