chore(deps): update dependency microsoft.graph.authentication to v2.15.0

This MR contains the following updates:

Package	Update	Change
Microsoft.Graph.Authentication	minor	2.14.1 -> 2.15.0

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Release Notes

microsoftgraph/msgraph-sdk-powershell (Microsoft.Graph.Authentication)

v2.15.0

What's Changed

• [v2] Weekly OpenApiDocs Refresh in https://github.com/microsoftgraph/msgraph-sdk-powershell/pull/2606
• [v2] Examples Update in https://github.com/microsoftgraph/msgraph-sdk-powershell/pull/2599
• Adds an optional -RHV parameter that will assign response headers to a variable (Value provided to the optional RHV parameter) in https://github.com/microsoftgraph/msgraph-sdk-powershell/pull/2604

Full Changelog: https://github.com/microsoftgraph/msgraph-sdk-powershell/compare/2.14.0...2.15.0

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