Update dependency System.Collections.Immutable to 7.0.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
System.Collections.Immutable (source)	5.0.0 → 7.0.0

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Configuration

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[renovate]

⚠️ Artifact update problem

Renovate failed to update an artifact related to this branch. You probably do not want to merge this PR as-is.

♻ Renovate will retry this branch, including artifacts, only when one of the following happens:

• any of the package files in this branch needs updating, or
• the branch becomes conflicted, or
• you click the rebase/retry checkbox if found above, or
• you rename this PR's title to start with "rebase!" to trigger it manually

The artifact failure details are included below:

File name: undefined

Post-upgrade command 'dotnet restore SonarQube.VisualStudio.sln' has not been added to the allowed list in allowedCommands

[hashicorp-vault-sonar-prod]

Renovate Jira issue ID: SLVS-3005