* Add PHP 8.3 to test matrix
* Update psalm for 8.3 to work
* Update psalm suppressions
* Fix php-cs-fixer issue

* fixing build failures
- CodeIgniter tests only pass against 4.4, so update minimum (with a case insensitivity change to test)
- MongoDB using a now-deprecated semconv, which can be removed (we already have the suggested replacement)
- Psr16 using an old version of psalm
- adding missing phan config for ServerTiming and Container detector
- adding update-lowest and all-lowest Make targets to run tests against lowest installable dependencies
- remove deprecated docker-compose.version
- update Dockerfile to use the core one, with some contrib additions (opentelemetry, mongo)

* drop 7.4 support for server-timing and container detector
they use non-7.4-compatible syntax

* update actions + cache versions

this is caused by the moratorium on updating semconv, so I guess we will see more of these soon enough