Bump version to 0.2.3 with new upstream features and bug fixes

Makefile

@@ -52,8 +52,14 @@ $(BASE_NAME)_aarch64.s9pk: kamado-src
 # One-time (per boot) cross-arch build setup: register qemu binfmt
 # handlers so the emulated aarch64 ckpool stage can run, and create a
 # buildx builder that advertises both platforms.
+#
+# tonistiigi/binfmt, NOT multiarch/qemu-user-static: the latter ships
+# qemu 7.2, whose emulated gcc segfaults intermittently on real builds
+# (seen killing both the jansson compile and the test/sha256 link in the
+# ckpool stage). The uninstall clears any older same-named handler first.
 setup:
-	docker run --rm --privileged multiarch/qemu-user-static --reset -p yes
+	-docker run --rm --privileged tonistiigi/binfmt --uninstall qemu-aarch64 2>/dev/null
+	docker run --rm --privileged tonistiigi/binfmt --install arm64
 	-docker buildx rm $(BUILDER) 2>/dev/null
 	docker buildx create --name $(BUILDER) --driver docker-container \
 		--driver-opt network=host \