updated expiration_time in tests to use year < 2038, undeprecated it

[modular-magician]

When changing the code to upgrade to support second-generation-only instances, the authorized_networks tests failed to create instances because of the expiration_time. I assumed it had to do with the upgrade, so I deprecated the field, however, we later found out it is a limitation on the value of the year, so now I have updated the tests to use a year < 2038, and they pass on second generation instances.

Release Note Template for Downstream PRs (will be copied)

sql: undeprecated `settings.ip_configuration.authorized_networks.expiration_time`

Derived from GoogleCloudPlatform/magic-modules#3034

[ghost]

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