Release v22.23.8

Fixed

• Committing to an aggregate that already had events no longer fails with a concurrency violation when no one else wrote to it. Loading the aggregate left its expected position at zero, so any aggregate whose event source had a later event was rejected on every commit.
• The expected position is now captured before the aggregate's events are read, so an event appended by someone else while the aggregate is loading is still detected as a conflict at commit instead of being silently overwritten.
• For aggregates without event handlers, IsNew now reflects only the aggregate's own stream: events for the same event source in other streams no longer make it look existing.