v1.8.2 RC 1

v1.8.2

This release reverts a const-correctness change introduced in
v1.8.0 for the git_commit_create functions. We now retain the
const-behavior for the commits arguments from prior to v1.8.0.

This change was meant to resolve compatibility issues with bindings
and downstream users.

What's Changed

New features

• Introduce a stricter debugging allocator for testing by @ethomson in #6811

Bug fixes

• Fix constness issue introduced in #6716 by @ethomson in #6829

Build and CI improvements

• README: add experimental builds to ci table by @ethomson in #6816

Full Changelog: v1.8.1...v1.8.2