gitignore: drop unnecessary ignore rules

We no longer use python in this repository and CRL is no longer tested
so neither downloaded.
7 jobs for fix-uriparser-version in 7 minutes and 16 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #255850
cppcheck

00:00:50

passed #255851
luacheck

00:00:50

passed #255848
system-tests

00:03:00

passed #255849
system-valgrind-tests

00:04:23

passed #255846
unit-tests

00:01:46

passed #255853
unit-valgrind-tests

00:02:51

failed #255847
unit-valgrind-tests

00:01:10