Octodns-azure

* Several improvements to the maintenance mechanisms for this package
like CI improvements, documentation and packaging metadata fix.

* Adds Provider.list_zones to enable new dynamic zone config functionality
* Newly added support for subnet targeting using the [Subnet traffic-routing method](https://learn.microsoft.com/en-us/azure/traffic-manager/traffic-manager-routing-methods#subnet)
in Azure Traffic Managers.

* Add support for [Azure Private DNS](https://learn.microsoft.com/en-us/azure/dns/private-dns-overview)
* Add support for `status=up` pool value flag (aka [Always Serve](https://azure.microsoft.com/en-us/updates/alwaysservega/))

* Enable `SUPPORTS_ROOT_NS` for management of root NS records. Requires
`octodns>=0.9.16`. Note that Azure does not allow the removal of its own name
servers so in cases where your config doesn't include them the provider will
still leave them in place for Azure.
* Bug fixes around usage of the default value also inside pools of dynamic
records.

* Fix traffic manager authentication with new azure-identity
* Improved pinning for azure python module version requirements

* Include msrestazure in install_requires to get a hidden dep covered