Merge updates from debian/bullseye

.gitlab-ci.yml

.travis.yml

CMakeLists.txt

apt-pkg/acquire-item.cc

apt-pkg/contrib/configuration.cc

apt-pkg/contrib/fileutl.cc

apt-pkg/contrib/hashes.cc

apt-pkg/deb/dpkgpm.cc

apt-pkg/packagemanager.cc

debian/apertis/gitlab-ci.yml

debian/changelog

debian/gbp.conf

doc/apt-verbatim.ent

doc/examples/configure-index

doc/po/apt-doc.pot

methods/basehttp.cc

methods/rred.cc

po/apt-all.pot

po/ru.po

test/integration/framework