chore(deps): update dependency az.accounts to v2.12.4

This MR contains the following updates:

Package	Update	Change
Az.Accounts	patch	2.12.3 -> 2.12.4

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Release Notes

Azure/azure-powershell

v2.12.4

• Changed 'gallery' property to be optional in ARM metadata of 'Set-AzEnvironment' and 'Add-AzEnvironment'[#​22037].

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