typst - Remove blockquote definition leftover

it has been removed in Pandoc 3.1.10, as the writer is now using `quote()` directly.

Change done upstream at jgm/pandoc@aa95770

Author: cderv

src/resources/formats/typst/pandoc/quarto/definitions.typ

@@ -1,9 +1,4 @@
 // Some definitions presupposed by pandoc's typst output.
-#let blockquote(body) = [
-  #set text( size: 0.92em )
-  #block(inset: (left: 1.5em, top: 0.2em, bottom: 0.2em))[#body]
-]
-
 #let horizontalrule = line(start: (25%,0%), end: (75%,0%))
 
 #let endnote(num, contents) = [