Log Message:
Update to zlib-0.6.2.3

0.6.2.3 Emily Pillmore <emilypi@cohomolo.gy> February 2021

 * Add support for bytestring-0.11.0.0

0.6.2.2 Julian Ospald <hasufell@posteo.de> August 2020

 * Bump bundled zlib to 1.2.11, fixes #26
 * New build flag to force use of the bundled zlib C sources, #31
 * Simpler build support for ghcjs, #25
 * Add support for GHC 8.10 / base-4.14, #29