Update google/go-github to v75

[asvoboda]

Now that https://github.com/google/go-github/releases/tag/v75.0.0 is out

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Description

Update google/go-github to v75

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[Copilot]

Pull Request Overview

This PR updates the google/go-github dependency from version 74 to version 75 to take advantage of the latest release. The change involves updating the module version in go.mod and updating all corresponding import statements throughout the codebase.

• Updated go.mod to use github.com/google/go-github/v75 instead of v74
• Updated all import statements across the codebase to reference the new v75 module path
• Maintained consistency across all files that import the go-github library

Reviewed Changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
go.mod	Updated dependency version from v74.0.0 to v75.0.0
githubapp/installations.go	Updated import path to use v75 module
githubapp/dispatcher.go	Updated import path to use v75 module
githubapp/context_test.go	Updated import path to use v75 module
githubapp/context.go	Updated import path to use v75 module
githubapp/client_creator.go	Updated import path to use v75 module
githubapp/caching_client_creator.go	Updated import path to use v75 module
example/issue_comment.go	Updated import path to use v75 module
appconfig/appconfig_test.go	Updated import path to use v75 module
appconfig/appconfig.go	Updated import path to use v75 module

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