Bump zlib to 1.3.1

[Friendseeker]

This PR bump zlib (used for native-image-musl) to 1.3.1, which is the latest zlib release

https://github.com/madler/zlib/releases/tag/v1.3.1

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[Friendseeker]

Signed the OCA, pending OCA approval.

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[fniephaus]

Hi @Friendseeker,

Thanks for the PR! IIRC, we picked this one commit of zlib because that fixed a bug that would cause problems with native images. Is there a particular reason you suggest to upgrade zlib? We should probably also upgrade musl and use what we recommend on our website: musl-1.2.4 and zlib-1.2.13.

What do you think?

[Friendseeker]

Hi @Friendseeker,

Thanks for the PR! IIRC, we picked this one commit of zlib because that fixed a bug that would cause problems with native images. Is there a particular reason you suggest to upgrade zlib? We should probably also upgrade musl and use what we recommend on our website: musl-1.2.4 and zlib-1.2.13.

What do you think?

That sounds fantastic. I shall update the PR to bump musl & zlib to the recommended version.

[fniephaus]

bump musl

It's unfortunately not that straightforward, but the build instructions are still relatively simple to follow.
I've pushed af9cc8d to dev.