__package_pip: match package names case insensitive

Pip matches them insensitive, so we need to do the same to avoid
problems by saying extras are not installed but already is there in
place.
3 jobs for feature/__package_pip/extras in 1 minute and 2 seconds (queued for 10 seconds)
Status Job ID Name Coverage
  Test
passed #7940
pycodestyle

00:00:19

passed #7939
shellcheck

00:00:22

passed #7941
unit_tests

00:00:21