Update Terraform gitlab to ~> 3.15.0

This MR contains the following updates:

Package	Type	Update	Change
gitlab (source)	required_provider	minor	~> 3.14.0 -> ~> 3.15.0

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Release Notes

gitlabhq/terraform-provider-gitlab

v3.15.1

Compare Source

This release was tested against GitLab 14.9, 14.10 and 15.0 for both CE and EE.

BUG FIXES:

• resource/gitlab_service_microsoft_teams: Fix removal from state when integration is not found (#​1113)

v3.15.0

Compare Source

This release was tested against GitLab 14.9, 14.10 and 15.0 for both CE and EE.

FEATURES:

• New Data Source: gitlab_cluster_agent (#​1073)
• New Data Source: gitlab_cluster_agents (#​1073)
• New Data Source: gitlab_project_milestone (#​1044)
• New Data Source: gitlab_project_milestones (#​1044)
• New Resource: gitlab_project_milestone (#​1044)
• New Resource: gitlab_runner (#​1049)
• New Resource: gitlab_cluster_agent (#​1073)

IMMROVEMENTS:

• resource/gitlab_group: Allow value 3 for default_branch_protection attribute (#​1070)
• resource/gitlab_project_badge: Add name attribute (#​1052)
• resource/gitlab_group: Transfer a subgroup does not longer re-create the group (#​1078)
• resource/gitlab_topic: Add name attribute (#​1095)

BUG FIXES:

• resource/gitlab_project_issue: Remove Optional from Computed-only attributes (#​1081)
• datasource/gitlab_project_issues: Fix type of not_milestone attribute from list of strings to a single string (#​1095)

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