Bump version of go-github to v49

[gmlewis]

This release contains the following breaking API changes:

• Fix JSON protection unmarshal error #2606
• Change actions billing structs to maps #2597

and the following additional changes:

• Bump scrape and examples to use v48.2.0 #2596
• Fix GitHub docs URL for get repository API #2600
• Enable secret scanning with the enterprise-level REST API #2607
• Add installation in CodeScanningAlertEvent type. #2609
• Add support for GitHub Environments for Pro/Teams pricing plans #2611

[gmlewis]

@xorima - do you have time to review this PR?

[codecov]

Codecov Report

Merging #2616 (4cdc96f) into master (eaa7559) will not change coverage.
The diff coverage is n/a.

❗ Current head 4cdc96f differs from pull request most recent head e408083. Consider uploading reports for the commit e408083 to get more accurate results

@@           Coverage Diff           @@
##           master    #2616   +/-   ##
=======================================
  Coverage   98.00%   98.00%           
=======================================
  Files         127      127           
  Lines       10969    10969           
=======================================
  Hits        10750    10750           
  Misses        150      150           
  Partials       69       69           

Impacted Files	Coverage Δ
github/github.go	97.45% <ø> (ø)

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