fix(deps): update module github.com/google/go-github/v49 to v50 in go.mod

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
github.com/google/go-github/v49	require	major	v49.1.0 -> v50.0.0

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Release Notes

google/go-github

v50.0.0

Compare Source

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)

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[nitrocode]

The error shown

# github.com/runatlantis/atlantis/server/events/vcs
server/events/vcs/github_client.go:333:18: cannot use *review.SubmittedAt (variable of type "github.com/google/go-github/v50/github".Timestamp) as type time.Time in struct literal
FAIL	github.com/runatlantis/atlantis/cmd [build failed]

atlantis/server/events/vcs/github_client.go

Lines 66 to 68 in 9add331

	type GithubReview struct {
	ID githubv4.ID
	SubmittedAt githubv4.DateTime