Fix doomemacs#5093: git version doctor check on macOS

git version's output is formatted differently on macOS (because of
course it is), so I use a more flexible check.

core/cli/doctor.el

@@ -62,12 +62,17 @@ in."
   (print-group!
    (if (not (executable-find "git"))
        (error! "Couldn't find git on your machine! Doom's package manager won't work.")
-     (let ((version (cadr (split-string
-                           (cdr (doom-call-process "git" "version"))
-                           " version "))))
-       (when (version< version "2.28")
-         (error! "Git %s detected! Doom requires git 2.28 or newer!"
-                 version))))
+     (save-match-data
+       (let* ((version
+               (cdr (doom-call-process "git" "version")))
+              (version
+               (and (string-match "\\_<[0-9]+\\.[0-9]+\\(\\.[0-9]+\\)\\_>" version)
+                    (match-string 0 version))))
+         (if version
+             (when (version< version "2.28")
+               (error! "Git %s detected! Doom requires git 2.28 or newer!"
+                       version))
+           (warn! "Cannot determine Git version. Doom requires git 2.28 or newer!")))))
 
    (unless (executable-find "rg")
      (error! "Couldn't find the `rg' binary; this a hard dependecy for Doom, file searches may not work at all")))