[chore] bump debian version (open-telemetry#21177)

Getting 404s when trying to run apt update w/ debian 9

---------

Signed-off-by: Alex Boten <[email protected]>
(cherry picked from commit 80069fb)

internal/buildscripts/packaging/fpm/Dockerfile

@@ -1,4 +1,4 @@
-FROM debian:9
+FROM debian:11
 
 RUN apt-get update && \
     apt-get install -y ruby ruby-dev rubygems build-essential git rpm

internal/buildscripts/packaging/fpm/deb/Dockerfile.test

@@ -1,22 +1,22 @@
-# A debian9 image with systemd enabled.  Must be run with:
+# A debian11 image with systemd enabled.  Must be run with:
 # `-d --privileged -v /sys/fs/cgroup:/sys/fs/cgroup:ro` flags
-FROM debian:9
-
-RUN apt-get update &&\
-    apt-get install -yq ca-certificates procps systemd
+FROM debian:11
 
 ENV container docker
-RUN (cd /lib/systemd/system/sysinit.target.wants/; for i in *; do [ $i = \
-    "systemd-tmpfiles-setup.service" ] || rm -f $i; done); \
-    rm -f /lib/systemd/system/multi-user.target.wants/*;\
-    rm -f /lib/systemd/system/local-fs.target.wants/*; \
-    rm -f /lib/systemd/system/sockets.target.wants/*udev*; \
-    rm -f /lib/systemd/system/sockets.target.wants/*initctl*; \
-    rm -f /lib/systemd/system/anaconda.target.wants/*;
+ENV DEBIAN_FRONTEND noninteractive
 
-RUN systemctl set-default multi-user.target
-ENV init /lib/systemd/systemd
+# Enable systemd.
+RUN apt-get update ; \
+    apt-get install -y systemd systemd-sysv procps; \
+    apt-get clean ; \
+    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/* ; \
+    rm -rf /lib/systemd/system/multi-user.target.wants/* ; \
+    rm -rf /etc/systemd/system/*.wants/* ; \
+    rm -rf /lib/systemd/system/local-fs.target.wants/* ; \
+    rm -rf /lib/systemd/system/sockets.target.wants/*udev* ; \
+    rm -rf /lib/systemd/system/sockets.target.wants/*initctl* ; \
+    rm -rf /lib/systemd/system/sysinit.target.wants/systemd-tmpfiles-setup* ; \
+    rm -rf /lib/systemd/system/systemd-update-utmp*
 
 VOLUME [ "/sys/fs/cgroup" ]
-
-ENTRYPOINT ["/lib/systemd/systemd"]
+CMD ["/lib/systemd/systemd"]