Prefer Turtle over HTML

[RubenVerborgh]

The current Accept header is application/trig,application/ld+json;q=0.9,text/html;q=0.8,application/xhtml+xml;q=0.72,application/n-quads;q=0.7,*/*;q=0.1, so https://www.w3.org/People/Berners-Lee/card loads as HTML.

Perhaps a dependency upgrade is sufficient.