[Tile-serving] [osm2pgsql-dev/osm2pgsql] Significantly reduce number of db connection in flex output (PR #2134)

[Ryan Lambert]

This works well in the initial load.  Before the patch I get 41 idle connections on my default load, this change drops it to 3 idle. :+1:

I ran into an error when using `osm2pgsql-replication`. I haven't dug any further than this error message yet.  All I changed in my project was cloning a different repo/branch. I can get the exact commands involved if needed for testing on your end.

```
2024-02-04 14:35:22  ERROR: --database: At Most 1 required but received 2
Traceback (most recent call last):
File "/usr/local/bin/osm2pgsql-replication", line 724, in <module>
sys.exit(main())
File "/usr/local/bin/osm2pgsql-replication", line 716, in main
return args.handler(props, args)
File "/usr/local/bin/osm2pgsql-replication", line 552, in update
```



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