ci: remove automatic update of already installed packages and set roxygen dependency to 7.1.0

2 jobs for 13-replace-vignette-examples-on-seine-river-by-a-fake-example-from-data-provided-by-airgr in 3 minutes and 44 seconds (queued for 6 seconds)
Status Name Job ID Coverage
  Checks
passed check_as_cran #139569
docker

00:03:38

passed check_not_cran #139568
docker

00:03:39