FIX Don't use a single quote even in a comment (#153)

Swapping the comment style too because I think bash will ignore it and I
want it to be ignored

.github/workflows/ci.yml

@@ -628,7 +628,7 @@ jobs:
                 $v = $j->require->{"silverstripe/installer"};
                 if (strpos($v, "^") === 0) {
                   $v = str_replace("^", "", $v) . ".x-dev";
-                  // Remove @beta, @rc, or @alpha if they're there
+                  # Remove @beta, @rc, or @alpha if they are there
                   $v = preg_replace("/@(alpha|beta|rc)/", "", $v);
                 }
                 $j->require->{"silverstripe/installer"} = $v;