Test and develop on postgres 15

[hackartisan]

To make this work locally I had to upgrade lando and upgrade my local postgres (running via brew -- its pg_dump is used to create the schema file stored with the rails project)

advances #5903

[tpendragon]

Things I had to do to get this installing locally:

HOMEBREW_NO_AUTO_UPDATE=1 brew upgrade postgresql
Install Lando 3.18.0 from https://github.com/lando/lando/releases
lando destroy
rake servers:start

I ended up with a local postgres 14 which seemed to work but isn't exactly right. To get 15 I think we'd have to uninstall 14, install postgresql@15, and then follow the instructions in the prompt to add some path stuff to ~/.zshrc.local

[hackartisan]

I just hit a problem since upgrading to postgres 15 locally where running rails server and hitting the database caused a segmentation fault. Adding export PGGSSENCMODE="disable" to my zshrc resolved it. there are issues in the pg repo, e.g. ged/ruby-pg#538

I also had to update my vim-test configuration like:

nnoremap <Leader>a :TestSuite PGGSSENCMODE=disable<CR>
nnoremap <Leader>t :TestFile PGGSSENCMODE=disable<CR>
nnoremap <Leader>n :TestNearest PGGSSENCMODE=disable<CR>
nnoremap <Leader>l :TestLast PGGSSENCMODE=disable<CR>