Update Terraform gitlab to ~> 18.6.0

This MR contains the following updates:

Package	Type	Update	Change
gitlab (source)	required_provider	minor	~> 18.5.0 -> ~> 18.6.0

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Release Notes

gitlabhq/terraform-provider-gitlab (gitlab)

v18.6.1

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BUG FIXES (1 change)

• docs: Clear old version of GitHub docs before copying new version in by @​heidi.berry (merge request)

v18.6.0

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FEATURES (2 changes)

• datasource/gitlab_artifact_file: Add gitlab_artifact_file data source by @​vijeta004 (merge request)
• datasource/gitlab_member_role: Add new datasource for retrieving member role by @​mness (merge request)

IMPROVEMENTS (3 changes)

• resource/gitlab_project_protected_environment: chore: improved the docs gitlab-project-protected-environment docs by @​bas.bremer (merge request)
• resource/gitlab_deploy_key_enable: Migrate gitlab_deploy_key_enable from SDK to framework plugin (merge request)
• datasource/gitlab_project_protected_branch: Harden the protected branch test by @​PatrickRice (merge request)

BUGS (3 changes)

• resource/gitlab_group: Update logging statement when retrieving push rules to be DEBUG instead of ERROR to prevent confusion by @​qerub (merge request)
• resource/gitlab_group_access_token, resource/gitlab_group_service_account_token, resource/gitlab_personal_access_token, resource/gitlab_project_access_token, resource/gitlab_user_impersonation_token, resource/gitlab_project_membership Fix an issue where nil expiry_date could cause a problem when refreshing tokens by @​vijeta004 (merge request)
• resource/gitlab_project_access_token, resource/gitlab_group_access_token, resource/gitlab_personal_access_token, resource/gitlab_group_service_account_access_token: fix(tokens): Update Access Token Validation Logic to only update token when expiry_date changes by @​PatrickRice (merge request)

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