Bump go-github to v57

[kfcampbell]

This PR supercedes #2011. I've chosen to follow 2 redirects in repository.GetBranch, the same as in that PR.

There were 10 instances of our project using now-deprecated methods, so I've switched those uses to the recommended methods.

[goodtune]

I believe that this has caused a reoccurrence of #1147.

5.43.0

2024-02-16T16:41:08.606+1100 [DEBUG] provider.terraform-provider-github_v5.43.0: 2024/02/16 16:41:08 [DEBUG] GitHub API Request Details:
2024-02-16T16:41:08.606+1100 [DEBUG] provider.terraform-provider-github_v5.43.0: ---[ REQUEST ]---------------------------------------
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2024-02-16T16:41:08.606+1100 [DEBUG] provider.terraform-provider-github_v5.43.0
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2024-02-16T16:41:08.606+1100 [DEBUG] provider.terraform-provider-github_v5.43.0: -----------------------------------------------------
2024-02-16T16:41:09.022+1100 [DEBUG] provider.terraform-provider-github_v5.43.0: 2024/02/16 16:41:09 [DEBUG] GitHub API Response Details:
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2024-02-16T16:41:09.022+1100 [DEBUG] provider.terraform-provider-github_v5.43.0: HTTP/2.0 200 OK

5.45.0

2024-02-16T14:27:01.527+1100 [DEBUG] provider.terraform-provider-github_v5.45.0: 2024/02/16 14:27:01 [DEBUG] GitHub API Request Details:
2024-02-16T14:27:01.527+1100 [DEBUG] provider.terraform-provider-github_v5.45.0: ---[ REQUEST ]---------------------------------------
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2024-02-16T14:27:01.527+1100 [DEBUG] provider.terraform-provider-github_v5.45.0
2024-02-16T14:27:01.527+1100 [DEBUG] provider.terraform-provider-github_v5.45.0: -----------------------------------------------------
2024-02-16T14:27:01.863+1100 [DEBUG] provider.terraform-provider-github_v5.45.0: 2024/02/16 14:27:01 [DEBUG] GitHub API Response Details:
2024-02-16T14:27:01.863+1100 [DEBUG] provider.terraform-provider-github_v5.45.0: ---[ RESPONSE ]--------------------------------------
2024-02-16T14:27:01.863+1100 [DEBUG] provider.terraform-provider-github_v5.45.0: HTTP/2.0 422 Unprocessable Entity
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2024-02-16T14:27:01.863+1100 [DEBUG] provider.terraform-provider-github_v5.45.0: X-Ratelimit-Resource: core
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We are an Enterprise user and have just encountered this. Will downgrade in the short term, but this will be an ongoing problem.