Linking to libssl, libcrypto and libz breaks manylinux compatibility according to PEP-513

[vsbogd]

Reading PyO3 extension-module documentation mentioned in #432 I have found link to the PEP-513 which says that manylinux1 compatible extensions should not be dynamically linked to the shared libraries out of the provided list. Thus libssl, libcrypro and libz which are used by Git feature breaks compatibility.

[luketpeterson]

Hmmm. That's annoying.

It appears that https://pypi.org/project/GitPython/ uses gitoxide-core through https://github.com/Byron/gitoxide/tree/main

So perhaps we can get rid of the libgit2 downstream dependencies by moving to gitoxide-core. I can try that out.

[vsbogd]

It is worth to mention #725 is also related. Dynamic linkage of the system libraries in MacOSX leads to the packages which are incompatible with old MacOSX version and checkers used by cibuildwheel finds this.