v4.3.0 released

Thanks to the team and many contributors, we released v4.3.0 with many enhancements.

Unfortunately, there are some breaking changes, so please upgrade with caution.
Please read ChangeLog and Upgrading Guide carefully.

You must update spark file and a few Config files.

I hope most existing apps will not break unless you use your own classes that extend framework classes.

And some of the default Config values in the Config files have changed, but existing apps will most likely not break unless you change the Config values  by yourself.

This release contains over 50 enhancements. A few things I want to highlight:

- Query Builder supports upsert() and upsertBatch(), deleteBatch(), and now *batch() methods can set data from a query
- Database Forge supports to add indexes in the existing tables and name indexes
- "spark route" command enhancements
- Improvement for CLI command testing
- View Cells enhancements

You can see the list of enhancements in https://www.codeigniter.com/user_guide/c...hancements

ChangeLog: https://www.codeigniter.com/user_guide/c...4.3.0.html
Upgrading Guide: https://www.codeigniter.com/user_guide/i...e_430.html

Update: a bug was reported. When you set Email config via Environment Variables (.env),
some config items are not set if you use the new Email Config file.
See https://github.com/codeigniter4/CodeIgni...ssues/7077

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