[1.x] fix(tags): sanitize page param in Tag

[rob006]

Fix errors for requests like https://discuss.flarum.org/t/sandbox?page=%27nvOpzp;%20AND%201=1%20OR%20(%3C%27%22%3EiKO))

PHP Warning:  A non-numeric value encountered in vendor/flarum/tags/src/Content/Tag.php on line 84

Uses the same solution as in:

framework/framework/core/src/Forum/Content/Index.php

Line 70 in 1d27f62

$page = max(1, intval(Arr::pull($queryParams, 'page')));