update leveldb to v1.23

[mrx23dot]

It promises better performance:

"Optimize leveldb block seeks to utilize the current iterator location. This is beneficial when iterators are reused and seeks are not random but increasing. It is additionally beneficial with larger block sizes and keys with common prefixes."

https://github.com/google/leveldb/releases
Feb 23, 2021 v1.23

If possible then compile with -Ofast -m32 (fastest portable), not sure if separate 64bit would speed things up.

in
https://github.com/wbolster/plyvel/blob/main/scripts/install-leveldb.sh
and in wheels

[slavabzb]

and now v1.23 is default on macOS Sonoma, so it's not that easy to just brew install leveldb and get plyvel ready for use

[wbolster]

so it's not that easy to just brew install leveldb

why not? shouldn't it be backwards compatible?