units: remove the restart limit on the modprobe@.service

They are various cases where the same module might be repeatedly
loaded in a short time frame, for example if a service depending on a
module keep restarting, or if many instances of such service get
started at the same time. If this happend the modprobe@.service
instance will be marked as failed because it hit the restart limit.

Overall it doesn't seems to make much sense to have a restart limit on
the modprobe service so just disable it.

Fixes: #23742

units/modprobe@.service

@@ -13,6 +13,7 @@ DefaultDependencies=no
 Before=sysinit.target
 Documentation=man:modprobe(8)
 ConditionCapability=CAP_SYS_MODULE
+StartLimitIntervalSec=0
 
 [Service]
 Type=oneshot