Bump version of go-github to v55.0.0

[gmlewis]

This release contains the following breaking API changes:

• Add missing fields to SecurityAdvisoryEvent and rename others #2889

and the following additional changes:

• Bump go-github from v53 to v54 in /scrape #2882
• Add support for enable/disable private vulnerability reporting on repositories #2887
• Add support for organization, repository webhook configuration #2885
• Return json.Unmarshal error when importing issues deferred #2892
• Remove dependency on "golang.org/x/oauth2" #2895
• Add support for dependabot_alert webhook event #2888
• Fix merge issue from field renaming #2906
• Add missing CodeScanning endpoints #2900
• Update package constructors #2904
• Fix serialization of repository_names conditions object #2910
• Bump actions/checkout from 3 to 4 #2912

[codecov]

Codecov Report

Merging #2914 (c8cacef) into master (5eddfaa) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2914   +/-   ##
=======================================
  Coverage   98.12%   98.12%           
=======================================
  Files         142      142           
  Lines       12453    12453           
=======================================
  Hits        12219    12219           
  Misses        159      159           
  Partials       75       75           

Files Changed	Coverage Δ
github/github.go	98.10% <ø> (ø)