kernel-headers-test: Replace deprecated balenalib base with debian:bullseye

The balenalib base images were deprecated some time ago, and this one also
pinned a dated tag from 2023 that no longer receives updates. Use the
upstream debian:bullseye image instead. The recipe installs everything it
needs with apt, so nothing from the balenalib layer was being used.

Change-type: patch
Signed-off-by: Kyle Harding <kyle@balena.io>

Author: klutchell

meta-balena-common/recipes-kernel/linux/files/Dockerfile

@@ -1,4 +1,4 @@
-FROM balenalib/intel-nuc-debian:bullseye-20230328
+FROM debian:bullseye
 
 # Install dependencies
 RUN apt-get update && apt-get install -y curl wget build-essential libelf-dev bc flex libssl-dev bison gcc-arm-linux-gnueabi gcc-aarch64-linux-gnu python3-minimal