[release/7.0] Upgrade zlib to 1.3.1 #99474
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"implicit-int-conversion" warning The change to deflate.c is legal because 'len' has an upper bound of MAX_STORED, which means it fits cleanly into a 16-bit integer. So writing out 2x 8-bit values will not result in data loss. The change to trees.c is legal because within this loop, 'count' is intended to have an upper bound of 138, with the target assignment only executing if 'count' is bounded by 4. Neither the 'count' local in isolation nor the addition that's part of the target line is expected to result in integer overflow. But even if it did, that's a matter for a different warning code and doesn't impact the correctness of the narrowing cast being considered here. Author: Levi Broderick <levib@microsoft.com>
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Backport of #99472
Customer Impact
This is a required OSS update of our zlib library from version 1.2.13 (it has no CVEs) to the latest version, 1.3.1.
Regression
The 1.3.1 official release notes with the list of fixed bugs can be found here: https://github.com/madler/zlib/releases/tag/v1.3.1
Testing
Upstream unit testing in the official madler/zlib repo.
Our unit tests are also passing.
Risk
Very low.
Will merge the main PR first, then if no issues found on the next month, will merge this PR on Code Complete for the May Release (~mid April).