Upgrade zlib library to 1.2.12

Dear VLC,

I wish to request that the most recent version of zlib 1.2.12 be included in a future release of VLC, please? A 17 year old CVE has been fixed within it:

https://nakedsecurity.sophos.com/2022/03/29/zlib-data-compressor-fixes-17-year-old-security-bug-patch-errr-now/

Thank you.

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