Update zlib to 1.2.12
Update zlib to 1.2.12

Summary:
zlib 1.2.11 no more:

```
% wget http://www.zlib.net/zlib-1.2.11.tar.gz
--2022-03-28 11:35:11--  http://www.zlib.net/zlib-1.2.11.tar.gz
Resolving www.zlib.net (www.zlib.net)... 85.187.148.2
Connecting to www.zlib.net (www.zlib.net)|85.187.148.2|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2022-03-28 11:35:12 ERROR 404: Not Found.
```
causing CI build failures such as https://github.com/facebook/fbthrift/runs/5725264581?check_suite_focus=true.

Replace it with 1.2.12 which exists on the zlib website.

Reviewed By: wittgenst

Differential Revision: D35191193

fbshipit-source-id: a3ac2c0feeafeb3d3b782ebce535b94e2bace04e

facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro,facebook/bistro