Dockerfile: bump Debian to 12, Go to 1.21

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
(cherry picked from commit b74b33c)
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

Dockerfile

@@ -1,10 +1,10 @@
-ARG GO_VERSION=1.20
+ARG GO_VERSION=1.21
 ARG BATS_VERSION=v1.9.0
 ARG LIBSECCOMP_VERSION=2.5.5
 
-FROM golang:${GO_VERSION}-bullseye
+FROM golang:${GO_VERSION}-bookworm
 ARG DEBIAN_FRONTEND=noninteractive
-ARG CRIU_REPO=https://download.opensuse.org/repositories/devel:/tools:/criu/Debian_11
+ARG CRIU_REPO=https://download.opensuse.org/repositories/devel:/tools:/criu/Debian_12
 
 RUN KEYFILE=/usr/share/keyrings/criu-repo-keyring.gpg; \
     wget -nv $CRIU_REPO/Release.key -O- | gpg --dearmor > "$KEYFILE" \