/usr/share/hakyll/templates/rss-item.xml is in libghc-hakyll-dev 4.7.5.1-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | <item>
<title>$title$</title>
<link>$root$$url$</link>
<description><![CDATA[$description$]]></description>
<pubDate>$published$</pubDate>
<guid>$root$$url$</guid>
<dc:creator>$authorName$</dc:creator>
</item>
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