Missing driver exception annotations

The situation reported as an exception is unlikely to happen and there's no test that reproduces it.

Remove ExceptionConverterDriver

Remove PingableConnection

Remove deprecated driver classes

Remove the no longer needed error suppressions

Deprecate ServerInfoAwareConnection#requiresQueryForServerVersion() as an implementation detail

Deprecate PingableConnection in favor of handling lost connection

Update Slevomat Coding Standard to 6.3.10

Deprecate ExceptionConverterDriver

Fixes for the recently introduced driver-level deprecations

Update PHPStan to 0.12.31

Remove ServerInfoAwareConnection#requiresQueryForServerVersion() as an implementation detail