Eric Kilmer 07b9eeecd2
[z3] Update to 4.8.16 (#24407)
* [z3] Update to 4.8.16

* Use Python3 instead of Python2

Python2 is EOL and the build script works with Python3, so we should
prefer Python3

* Update version
2022-04-26 19:24:59 -07:00
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