InspIRCd: fix various audit warnings.

Closes #35344.

Signed-off-by: Mike McQuaid <mike@mikemcquaid.com>
Extract method
Remove duplicated logic from FromUrlLoader
Preserve backtrace from original exception
remove patch for Groonga 4.0.8

* Because it is no longer needed.
groonga 4.0.9
groonga: update 4.0.9 bottle.