Update Cirros to 0.5.2

This release [1] includes a single fix [2] pulling in the ahci module
which is required by Iad1adbc23b31dd54a96299e7a8a4b622c15eed8d, a
nova-next change introducing q35 testing to the job.

This depends on the following change caching the image within the CI
host image:

Depends-On: https://review.opendev.org/c/openstack/project-config/+/779178/

[1] https://github.com/cirros-dev/cirros/releases/tag/0.5.2
[2] https://github.com/cirros-dev/cirros/pull/65

Change-Id: I12e0bdb3699e5343592ab834468ba6b2fcdcaaf4
diff --git a/stackrc b/stackrc
index 205481b..1bcc302 100644
--- a/stackrc
+++ b/stackrc
@@ -657,7 +657,7 @@
 #IMAGE_URLS="http://smoser.brickies.net/ubuntu/ttylinux-uec/ttylinux-uec-amd64-11.2_2.6.35-15_1.tar.gz" # old ttylinux-uec image
 #IMAGE_URLS="http://download.cirros-cloud.net/${CIRROS_VERSION}/cirros-${CIRROS_VERSION}-${CIRROS_ARCH}-disk.img" # cirros full disk image
 
-CIRROS_VERSION=${CIRROS_VERSION:-"0.5.1"}
+CIRROS_VERSION=${CIRROS_VERSION:-"0.5.2"}
 CIRROS_ARCH=${CIRROS_ARCH:-"x86_64"}
 
 # Set default image based on ``VIRT_DRIVER`` and ``LIBVIRT_TYPE``, either of