Warnings using unshallow_all

[SlaunchaMan]

When running rake unshallow_all, I get these warnings for all repos:

remote: Enumerating objects: 1645, done.
remote: Counting objects: 100% (1645/1645), done.
remote: Compressing objects: 100% (651/651), done.
remote: Total 1585 (delta 861), reused 1537 (delta 815), pack-reused 0
Receiving objects: 100% (1585/1585), 250.58 KiB | 2.85 MiB/s, done.
Resolving deltas: 100% (861/861), completed with 42 local objects.

Overwrite fetch configuration
error: unknown option `set'
usage: git config [<options>]

Config file location
    --global              use global config file
    --system              use system config file
    --local               use repository config file
    --worktree            use per-worktree config file
    -f, --file <file>     use given config file
    --blob <blob-id>      read config from given blob object

Action
    --get                 get value: name [value-regex]
    --get-all             get all values: key [value-regex]
    --get-regexp          get values for regexp: name-regex [value-regex]
    --get-urlmatch        get value specific for the URL: section[.var] URL
    --replace-all         replace all matching variables: name value [value_regex]
    --add                 add a new variable: name value
    --unset               remove a variable: name [value-regex]
    --unset-all           remove all matches: name [value-regex]
    --rename-section      rename section: old-name new-name
    --remove-section      remove a section: name
    -l, --list            list all
    -e, --edit            open an editor
    --get-color           find the color configured: slot [default]
    --get-colorbool       find the color setting: slot [stdout-is-tty]

Type
    -t, --type <>         value is given this type
    --bool                value is "true" or "false"
    --int                 value is decimal number
    --bool-or-int         value is --bool or --int
    --path                value is a path (file or directory name)
    --expiry-date         value is an expiry date

Other
    -z, --null            terminate values with NUL byte
    --name-only           show variable names only
    --includes            respect include directives on lookup
    --show-origin         show origin of config (file, standard input, blob, command line)
    --default <value>     with --get, use default value when missing entry```

I'm running `git` version 2.20.1.

[segiddins]

@dnkoutso I believe we had a fix for this?