message: fixing r test case
diff: +#skip_on_cran()
  +
  library("DBI")
  library("testthat")
  load_extension <- function(extension_name) {
  - con <- dbConnect(duckdb::duckdb())
  + con <- dbConnect(duckdb::duckdb(config=list("allow_unsigned_extensions"="true")))
  matches <- list.files(pattern='*.duckdb_extension', recursive=FALSE, full.names=TRUE)
  matches <- c(matches, list.files(path='/tmp/duckdb_extensions', pattern='*.duckdb_extension', recursive=TRUE, full.names=TRUE))
  matches <- c(matches, list.files(path=system.file(package = 'duckdb'), pattern='*.duckdb_extension', recursive=TRUE, full.names=TRUE))
  