bullseye-amd64-tf-m-qemu: update QEMU version to 1:6.1

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I7dae68bb05fbefaae6482e75f43f652d090d3fdc
diff --git a/bullseye-amd64-tf-m-qemu/Dockerfile b/bullseye-amd64-tf-m-qemu/Dockerfile
index 822ce20..831209e 100644
--- a/bullseye-amd64-tf-m-qemu/Dockerfile
+++ b/bullseye-amd64-tf-m-qemu/Dockerfile
@@ -1,6 +1,6 @@
 FROM debian:sid-slim
 
-ENV QEMU_VERSION="1:5.2+dfsg-6"
+ENV QEMU_VERSION="1:6.1+dfsg-5"
 ENV DEBIAN_FRONTEND=noninteractive
 ENV PKG_DEPS="\
     ca-certificates \