Update Terraform gitlab to ~> 18.4.0

This MR contains the following updates:

Package	Type	Update	Change
gitlab (source)	required_provider	minor	~> 18.3.0 -> ~> 18.4.0

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Release Notes

gitlabhq/terraform-provider-gitlab (gitlab)

v18.4.1

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IMPROVEMENTS (1 change)

• Bumped GitLab client-go dependency to v0.148.0 to improve default retry policy (merge request)

v18.4.0

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FEATURES (2 changes)

• resource/gitlab_group_level_mr_approvals: Add group level merge request approvals resource by @​heidi.berry (merge request)
• resource/gitlab_project_external_status_check: Add new resource for project external status checks by @​mness (merge request)

IMPROVEMENTS (1 change)

• resource/gitlab_project_hook: Update docs to indicate which version of GitLab is required to use custom headers by @​heidi.berry (merge request)

BUG FIXES (2 changes)

• resource/gitlab_group_service_account: Wait for group service account users to be deleted during destroy by @​heidi.berry (merge request)
• resource/gitlab_group_share_group: Add feature flag information for using custom roles by @​heidi.berry (merge request)

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