fix `gm report`

[amtoine]

gm repo bisect --good 0.87.0 --bad 0.89.0 {
    cargo run -- --config $nu.config-path --env-config $nu.env-path -c "gm report | length"
}

gives

fa5d7babb9c1ff94cf2262a0db16b59df9e02936

i.e. https://github.com/nushell/nushell/pull/11258