Revert "testing/py3-pelican: upgrade to 4.6.0"

This reverts commit af537c70.

 - Fails to create binaries
7 jobs for !20381 with py3-pelican in 1 minute and 24 seconds (queued for 1 second)
detached
Status Job ID Name Coverage
  Lint
passed #369321
docker-alpine x86_64
lint

00:00:18

 
  Build
canceled #369326
docker-alpine ci-build aarch64
build-aarch64

canceled #369327
docker-alpine ci-build armv7
build-armv7

passed #369325
docker-alpine ci-build ppc64le
build-ppc64le

00:00:51

passed #369324
docker-alpine ci-build s390x
build-s390x

00:01:05

passed #369323
docker-alpine ci-build x86
build-x86

00:00:23

passed #369322
docker-alpine ci-build x86_64
build-x86_64

00:00:23