service contact blocks contain new lines - and jinja2 normally ignores
newlines (as in it keeps them as new lines) - but we need to turn them
into `<br>` tags so that we can show the formatting that the user has
added. We were previously just doing `{{ block | nl2br | safe }}`. nl2br
turns the new lines into `<br>` tags, and then `safe` tells jinja that
it doesn't need to escape the html.
this causes issues if the user adds `<script>alert(1)</script>` to their
contact block (or some other evil xss hack), where that will get let
through due to the safe flag
To solve this, use `Markup(html='escape')` to sanitise any html, and
then convert new lines to <br>.
bump utils
another xss
5bbbdc3cd9