chore(deps): update terraform gitlab to v18.5.0

This MR contains the following updates:

Package	Type	Update	Change
gitlab (source)	required_provider	minor	18.4.1 -> 18.5.0

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Release Notes

gitlabhq/terraform-provider-gitlab (gitlab)

v18.5.0

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FEATURES (2 changes)

• datasource/gitlab_project_approval_rules: Add New Data Source for GitLab Project Approval Rules by @​markwork (merge request)
• resource/gitlab_group_service_account: Add support for custom timeouts to gitlab_group_service_account by @​PatrickRice (merge request)

IMPROVEMENTS (2 changes)

• datasource/gitlab_projects: Deprecate datasource gitlab_projects._links by @​heidi.berry (merge request)
• resource/gitlab_project: Add project resource group default process mode by @​n.h.long.9697 (merge request)

DOCUMENTATION (2 changes)

• Add missing deprecation notices to some resources and datasources by @​heidi.berry (merge request)
• Ensure deprecation notices properly display in the docs by @​heidi.berry (merge request)

BUG FIXES (3 changes)

• resource/gitlab_application_settings: Fix mapping package_metadata_purl_types in update by @​elC0mpa (merge request)
• resource/gitlab_project_membership: expires_at now validates that the date is not in the past, which previously caused an API error by @​elC0mpa (merge request)
• resource/gitlab_project_membership,resource/gitlab_group_membership: member_role_id will now be removed if not specified in the config, allowing users to revert to base roles by @​elC0mpa (merge request)

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