azurerm_postgresql_flexible_server - fix identity

[myc2h6o]

Fix #21025
identity type only accepts None and UserAssigned now: https://github.com/Azure/azure-rest-api-specs/blob/main/specification/postgresql/resource-manager/Microsoft.DBforPostgreSQL/stable/2022-12-01/FlexibleServers.json#L822-L825

[tombuildsstuff]

hi @myc2h6o

Thanks for this PR

There's an issue on the Pandora repository (hashicorp/pandora#2575) which @stephybun is taking a look into, which would ensure that this is accurately picked up as the default User Assigned Identity type, rather than this custom type - as such we'll want that fixed here to ensure this remains consistent, so I'm going to assign this PR to @stephybun so that once is fixed upstream, we can take a look into fixing.

Thanks!

[myc2h6o]

sdk version has been upgraded by #22053, I've rebased the branch.

[stephybun]

Thanks @myc2h6o LGTM 👍

[github-actions]

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