Bump version of go-github to v50

[gmlewis]

This release contains the following breaking API changes:

• Change total_minutes_used and included_minutes from int to float64 #2643
• Change all fields from time.Time to github.Timestamp #2646

and the following additional changes:

• Add new DeploymentBranchPolicies endpoints #2621
• Bump github.com/google/go-github/v49 from 49.0.0 to 49.1.0 in /scrape #2627
• Add RequireLastPushApproval field to UpdateBranchProtection #2629
• Add workflow_name to WorkflowJob struct #2630
• Support users and teams in branch protection access restrictions #2561
• Add httpcache code example to README.md #2632
• Bump golangci/golangci-lint-action from 3.3.1 to 3.4.0 #2638
• Add NewTokenClient #2637
• Add method to update codescanning alert #2639
• Add JSON tag for ErrorResponse #2641
• Use NewTokenClient in tests and examples #2644

[codecov]

Codecov Report

Merging #2647 (f57a332) into master (aa2c143) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2647   +/-   ##
=======================================
  Coverage   98.05%   98.05%           
=======================================
  Files         130      130           
  Lines       11257    11257           
=======================================
  Hits        11038    11038           
  Misses        150      150           
  Partials       69       69           

Impacted Files	Coverage Δ
github/github.go	97.46% <ø> (ø)

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