Update Terraform gitlab to v17.4.0

This MR contains the following updates:

Package	Type	Update	Change
gitlab (source)	required_provider	minor	17.3.1 -> 17.4.0

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Release Notes

gitlabhq/terraform-provider-gitlab (gitlab)

v17.4.0

Compare Source

This release was tested against GitLab 17.4, 17.3, and 17.2 for both CE and EE

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