GitPython submodule update path traversal can write outside the repository

Affected: GitPython 3.1.61 latest release and main — git/objects/submodule/base.py. git diff 3.1.61 origin/main -- git/objects/submodule/ is empty, so both are identical here. --- The gap The fix for GHSA-hmq2-w58f-27jc added Submodule.validatedname and wired it into update and five siblings,...