semaphore: move back to autopkgtest master branch

Instead of fixing the commit, we can workaround the adduser issue by
simply creating a user manually beforehand, which means the broken
codepath in autopkgtest is not taken. We can remove it once it's
fixed upstream, which is in progress:

https://salsa.debian.org/ci-team/autopkgtest/-/merge_requests/297
(cherry picked from commit 8b7485c)
(cherry picked from commit 4f4cd7c)
(cherry picked from commit 9b47039)

Author: bluca

.semaphore/semaphore-runner.sh

@@ -48,6 +48,8 @@ apt-get install -y fdisk tree libfdisk-dev libp11-kit-dev libssl-dev libpwqualit
 apt-get purge --auto-remove -y unattended-upgrades
 systemctl unmask systemd-networkd
 systemctl enable systemd-networkd
+# Remove once https://salsa.debian.org/ci-team/autopkgtest/-/merge_requests/297 is sorted
+adduser --disabled-login --gecos 'Temporary autopkgtest user,,,' autopkgtest
 EOF
     sudo lxc-stop -n "$CONTAINER"
 }
@@ -64,7 +66,7 @@ for phase in "${PHASES[@]}"; do
             sudo apt-get install -y -t "$UBUNTU_RELEASE-backports" lxc
             sudo apt-get install -y python3-debian git dpkg-dev fakeroot python3-jinja2
 
-            [ -d "$AUTOPKGTEST_DIR" ] || git clone --quiet --branch=debian/5.32 --depth=1 https://salsa.debian.org/ci-team/autopkgtest.git "$AUTOPKGTEST_DIR"
+            [ -d "$AUTOPKGTEST_DIR" ] || git clone --quiet --depth=1 https://salsa.debian.org/ci-team/autopkgtest.git "$AUTOPKGTEST_DIR"
 
             create_container
         ;;