Update Java model with list of time zones

[richfab]

Follow-up of #146

Context

The time zones in the schemas were replaced with the content of the TZ identifier column from this list.

Problem

The Java models are inconsistent with the spec because they use the previous list of time zones.

Solution

Update the Java models with the list of time zones from the schemas.

[leonardehrenfried]

You actually don't need to do much. The compiler will regenerate the types for you.

[richfab]

@leonardehrenfried Our dev team will update the Java model by the end of the month. If you need it before, feel free to open a PR if you want. Thank you!

[richfab]

@leonardehrenfried It seems that the update will happen sooner than expected. A PR was open by @Alessandro100 ⚡