Attempt for one last time to fix Xcode Cloud

This should hammer fix it. That'll show them for forcing a shallow
commit on me.

Signed-off-by: Christopher Snowhill <kode54@gmail.com>

ci_scripts/ci_pre_xcodebuild.sh

@@ -4,6 +4,8 @@ BASEDIR=$(dirname "$0")
 
 git=$(which git)
 
-"$git" -C "${BASEDIR}/.." fetch --tags
+REPO_ROOT_PATH=$("$git" rev-parse --show-toplevel)
+
+"$git" -C "$REPO_ROOT_PATH" fetch --unshallow --tags
 
 "${BASEDIR}/../Scripts/genversion.sh"