ignore-urls has problems with some urls. Make it literal interpretation?

[cansavvy]

From https://github.com/jhudsl/Computing_for_Cancer_Informatics/actions/runs/12794723463

##### Testing URLs from file: /github/workspace/01-intro.Rmd
Error in grep(paste0(ignore_urls, collapse = "|"), urls, invert = TRUE,  : 
  invalid regular expression 'https://en.wikipedia.org/wiki/Adder_(electronics', reason 'Missing ')''
Calls: lapply -> FUN -> grep
In addition: Warning message:
In grep(paste0(ignore_urls, collapse = "|"), urls, invert = TRUE,  :
  TRE pattern compilation error 'Missing ')''
Execution halted