Merge branch 'icasefs-symlink-confusion'

This topic branch fixes two vulnerabilities: - Recursive clones on case-insensitive filesystems that support symbolic links are susceptible to case confusion that can be exploited to execute just-cloned code during the clone operation. - Repositories can be configured to execute arbitrary code during local clones. To address this, the ownership checks introduced in v2.30.3 are now extended to cover cloning local repositories. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>