Reminder: Update py39cloud branch with next release

[jdblischak]

Note to self: with the next release of TileDB-SOMA, we need to update main as well as the branch py39cloud

We will only need to maintain the separate py39cloud branch for as long as we continue to maintain the py39 TileDB Cloud env. Hopefully the transition to py312 will not be protracted (and thus it's not worth updating our release guidelines)

cc: @johnkerl

[jdblischak]

@johnkerl reminder that we can't forget this step. When you open the update PR for 1.15.0 to merge into main, then I'll adapt your PR and submit one to the branch py39cloud

[johnkerl]

and thus it's not worth updating our release guidelines

I need to document what I do for as long as I have to do it -- this is why I have the release procedure -- I'll update it right now

[jdblischak]

Closed by #239 (GitHub only auto-closes an Issue when its linked PR is merged into main)