Tests use file base submodules which are now considered insecure by git

[campersau]

• https://github.com/git/git/security/advisories/GHSA-3wp6-j8xr-qw85
• https://github.blog/2022-10-18-git-security-vulnerabilities-announced/#cve-2022-39253
• https://git-scm.com/docs/git-config#Documentation/git-config.txt-protocolallow

Workaround by either specifying -c protocol.file.allow=always when running a git command or configure it globally git config --global protocol.file.allow always