fix(eventstore): correct sql push function (#9201)

# Which Problems Are Solved

https://github.com/zitadel/zitadel/pull/9186 introduced the new `push`
sql function for cockroachdb. The function used the wrong database
function to generate the position of the event and would therefore
insert events at a position before events created with an old Zitadel
version.

# How the Problems Are Solved

Instead of `EXTRACT(EPOCH FROM NOW())`, `cluster_logical_timestamp()` is
used to calculate the position of an event.

# Additional Context

- Introduced in https://github.com/zitadel/zitadel/pull/9186
- Affected versions:
https://github.com/zitadel/zitadel/releases/tag/v2.67.3

cmd/setup/40.go

@@ -48,5 +48,5 @@ func (mig *InitPushFunc) Execute(ctx context.Context, _ eventstore.Event) (err e
 }
 
 func (mig *InitPushFunc) String() string {
-	return "40_init_push_func_v3"
+	return "40_init_push_func_v4"
 }