cos-kdump-debugger: Change base image to debian:sid

The version of crash available in debian:bookworm-backports is old and
crashes when loading a kdump for the 6.6 kernel. Upgrading to sid
installs a newer crash which is compatible. This commit also switches to
libncurses6 from libncurses5, since libncurses5 is no longer supported.

BUG=b/316205830
TEST=Run crash for dump from kernel 6.6, kernel 6.1, and kernel 5.15

Change-Id: I7690c6ea290689cd964f4d7273756825c88975a7
Reviewed-on: https://cos-review.googlesource.com/c/cos/tools/+/71116
Reviewed-by: Arnav Kansal <rnv@google.com>
Cloud-Build: GCB Service account <228075978874@cloudbuild.gserviceaccount.com>
Tested-by: Kevin Berry <kpberry@google.com>
diff --git a/src/cmd/cos_kdump_debugger/Dockerfile b/src/cmd/cos_kdump_debugger/Dockerfile
index 60f99a0..fcb2325 100644
--- a/src/cmd/cos_kdump_debugger/Dockerfile
+++ b/src/cmd/cos_kdump_debugger/Dockerfile
@@ -1,12 +1,12 @@
 # Start from ubuntu
-FROM debian:bookworm-backports
+FROM debian:sid
 
 RUN apt-get update
 
 ARG DEBIAN_FRONTEND=noninteractive
 
 RUN apt-get install -y -qq --no-install-recommends crash gdb xz-utils curl vim \
-      liblzo2-2 libsnappy1v5 zlib1g libncurses5 binutils apt-transport-https ca-certificates gnupg
+      liblzo2-2 libsnappy1v5 zlib1g libncurses6 binutils apt-transport-https ca-certificates gnupg
 
 # Installs gsutil, following:
 # https://cloud.google.com/storage/docs/gsutil_install#sdk-install