Update snapshot test for new R version

Author: jennybc

tests/testthat/_snaps/upkeep.md

@@ -52,7 +52,7 @@
       ### To finish
       
       * [ ] `usethis::use_mit_license()`
-      * [ ] `usethis::use_package("R", "Depends", "3.6")`
+      * [ ] `usethis::use_package("R", "Depends", "4.0")`
       * [ ] `usethis::use_tidy_description()`
       * [ ] `usethis::use_tidy_github_actions()`
       * [ ] `devtools::build_readme()`