Hardcode short hash length to 9 characters in CI and packaging scripts.
It is not guaranteed that short hashes are the same length across
different platforms or different versions of git. This caused problems
with upload/download action names, as the hashes sometimes didn't match.
Fix the download artifact name in the Windows installer job and the
macOS notarization job to prevent them from failing due to a name
mismatch.
6bee92d054