- Set min. version requirement of `trio` to `0.25`,
so we don't have to set `strict_exception_groups` to `True` on older
versions (probably not even possible via `pytest-trio`)
- Fix compatibility with `trio>=0.25`:
Since `strict_exception_groups` now defaults to `True`, trio nurseries
now always raise an `ExceptionGroup` in all cases, so update tests
and handle exception groups instead. Don't unwrap exception groups
for now, even if only a single exception is included.
Explicitly handle `KeyboardInterrupt`/`SystemExit` and re-raise
by using the `exceptiongroup.catch` utility (<py311 compat)
bastimeyer