chore: Remove non-existing dependency from DESCRIPTION (#427)

Author: jeroen

DESCRIPTION

@@ -61,8 +61,6 @@ LinkingTo:
     cpp11
 VignetteBuilder:
     knitr
-Remotes:
-    schloerke/testthat@patch-2
 Config/Needs/check: rstudio/shiny, bslib
 Config/Needs/shinytest2-testing: decor
 Config/Needs/website: pkgdown, tidyverse/tidytemplate