After adding submodules support, checkout action fails on single repository. Roll back to version 2.0.0 fix the problem

/usr/bin/git submodule foreach --recursive git config --local --name-only --get-regexp 'core\.sshCommand' && git config --local --unset-all 'core.sshCommand' || : Error: fatal: No url found for submodule path 'MY_SINGLE_REPO' in .gitmodules Error: The process '/usr/bin/git' failed with exit code 128