EOL for bullseye-backports

Author: Paulchen-Panther

ubuntu_debian

@@ -27,7 +27,7 @@ RUN apt-get update
 # on debian bullseye add backports to install qt6
 RUN if [ "$SUITE" != "buster" ] && [ "$SUITE" != "focal" ] && [ "$QT_VERSION" = "6" ]; then \
     if [ "$SUITE" = "bullseye" ]; then \
-        echo "deb http://deb.debian.org/debian bullseye-backports main contrib non-free" | tee -a /etc/apt/sources.list; \
+        echo "deb http://archive.debian.org/debian bullseye-backports main contrib non-free" | tee -a /etc/apt/sources.list; \
         apt-get update; \
     fi; \
     if [ "$SUITE" = "jammy" ]; then SERIALPORT="libqt6serialport6-dev"; else SERIALPORT="qt6-serialport-dev"; fi; \