line 18: syntax error near unexpected token `('

I don't think this is really the fix but it _is_ shell, we don't need those
parents, let's see.

ci-tools/update-nixpkgs

@@ -27,8 +27,8 @@ setup_git() {
     git config --global user.name "Update Bot"
 }
 
-setup_ssh()
-setup_git()
+setup_ssh
+setup_git
 
 TARGET_BRANCH="nixpkgs-upgrade-$(date +%Y-%m-%d)"