Remove pre-bullseye release workaround

Switching version from sid to 11.0 was needed before bullseye has been
released. It is not required since then and can be safely removed.

Change-Id: Ibfb39e0c567091a347b7acaf26ee18271b25ce8c

diskimage_builder/elements/debootstrap/cleanup.d/99-set-bullseye-version

@@ -1,23 +0,0 @@
-#!/bin/bash
-#
-# Copyright 2021 Red Hat, Inc.
-#
-# Licensed under the Apache License, Version 2.0 (the "License"); you may
-# not use this file except in compliance with the License. You may obtain
-# a copy of the License at
-#
-#     http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
-# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
-# License for the specific language governing permissions and limitations
-# under the License.
-#
-if [ ${DIB_DEBUG_TRACE:-1} -gt 0 ]; then
-    set -x
-fi
-set -eu
-set -o pipefail
-
-sudo sed -i 's,bullseye/sid,11.0,' $TARGET_ROOT/etc/debian_version