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.
Current build scripts rely on comparing a architecture string provided
by the OS which will be localised in certain languages.
This change uses a boolean 64-bit flag to use script-defined identifiers
to avoid this issue.
